Season two, episode one: It Came from the Nightosphere
- Synopsis
- The Lord of Evil, who happens to be Marceline's dad, goes on a soul-sucking rampage after Finn releases him from the Nightosphere, causing great discomfort for Marceline.
- Trivia
- Marceline has in her living room a painting that resembles the Virgin Mary and Baby Jesus.
- This is Pen's favorite episode of the second season.
- This is the first episode story boarded by Rebecca Sugar, and to commemorate that fact, she made a special drawing.
- This is the first episode where Jake only receives a minor cameo and has no lines.
- Marceline's dog, Schwable, appears very briefly, and is never featured again in any other episode.
- Episode Connections
- Hunson calls Gunter the most evil thing he's encountered and as well as "dark one". Gunter is revealed to be a powerfull evil being in "Orgalorg".
- Storyline Analysis
- When Finn asks how to kill her dad, Marceline replies that he is "deathless" and that he "can't die." During his conversation with Gunter, the Lord of Evil does not finish the sentence "NO! You can't have my soul! I don't even have a—," implying that he does not have one. This is where his immortality and his "deathlessity" may steam from.
- After Marceline and Hunson Abadeer's fight at Red Rock Pass, Abadeer refers to his daughter as "not alive." This could mean she does not have a soul either. Though technically Vampires are classified as "Undead" along with Zombies.
Season two, episode two: The Eyes
- Synopsis
- Finn and Jake can't go to bed because a creepy horse outside of their house won't stop staring at them. They try their best to remove the horse without resorting to violent measures.
- Trivia
- The concept of Finn and Jake dealing with a threat after an exhausting period of adventuring echoes the unproduced episode "Brothers in Insomnia."
- It is revealed that Jake sleeps nude, rather than in the invisible pants he mentions in "Donny."
- Cultural References
- It is revealed in this episode that some portion of classical music still exists in the Land of Ooo, like the Moonlight Sonata, Eine Kleine Nachtmusik, Ride of the Valkyries and Beethoven's 5th Symphony.
- The appearance of the creepy horse was inspired by the "Shetland Pony" in Kate Beaton's webcomic, Hark! A Vagrant.
Season two, episode three: Loyalty to the King
- Synopsis
- Finn and Jake are excited to meet the Nice King who has come to Ooo, but when he starts giving orders, they realize he is the Ice King, only with a shaven beard
- Episode Connections
- The Ice King rejects Lumpy Space Princess in this episode, but in "Princess Monster Wife" he revealed that she is one of his favorite princesses.
- However, in "Hitman," he says that she and Ghost Princess are his least favorites.
- Cultural References
- The Ice King's "Nice King" appearance resembles Mr. Rogers'.
Season two, episode four: Blood Under the Skin
- Synopsis
- Finn decides to get the best armor in Ooo to show off towards several mocking knights, but in order to receive it, he must go on a quest where he must survive one embarrassing situation after another.
- Production Notes
- This episode was previously titled "Click-Click!" referring to the double tongue-clicking sound that is made throughout the episode.
- This episode did not originally air with the waving snail. The snail was later added to the reruns.
Season two, episode five: Storytelling
- Synopsis
- To satisfy a sick Jake, Finn goes through the woods to find a real-life story filled with romance, fighting, suspense, and drama to tell him.
- Trivia
- On the list that Jake writes, some letters are backwards and the handwriting is messy. However, in the episodes "Jake the Dad" and "Shh!," Jake writes very neatly in all caps.
- Production Notes
- The original title for this episode was "Story Tellin'."
- Mrs. Cow's udder was originally an eyeball, but it was soon changed to a PHIL FACE.
- Jake was originally pretending to be sick to get Finn out of the house so he could do weird stuff.
- The cage Finn was trapped in was originally made of animal droppings, and when Jake tells Finn what he was covered in, Finn vomits all over Jake.
- Instead of merely making Boobafina and Mr. Fox's lips touch briefly, Finn forces the two to open mouth kiss very sloppily and for much longer than in the aired version.
- Storyline Analysis
- There are many pieces of pre-war debris in the woods, such as at the place where the teen bear was spray painting. This is evidence of Land of Ooo's post-apocalyptic past.
Season two, episode six: Slow Love
- Synopsis
- Finn and Jake help an over-sized snail named Snorlock threatening to wreck their home by trying to find him a mate.
- Trivia
- This episode reveals that Finn has more than one sword.
- The Land of Ooo has a newspaper titled The Ooo Review.
Season two, episode seven: Power Animal
- Synopsis
- Jake has to overcome his super-short attention span and partying attitude to save Finn from the Grandmaster of the Gnomes, after Finn is kidnapped by his evil Gnome henchmen.
- Trivia
- The idea of an underground society beneath Finn and Jake's tree fort was adopted from an unproduced episode "Brothers in Insomnia."
- Cultural Reference
- Jake putting ice cream in his toaster is very similar to a scene in the movie Anchorman: The Legend of Ron Burgundy where Brick Tamland is introducing himself and puts ice cream in a toaster.
- The title of this episode is a play on the term "Party Animal." A power animal is also a shamanic term for a spirit guide which takes the form of an animal.
Season two, episode eight: Crystals Have Power
- Synopsis
- Jake takes a vow of non-violence, which is inconvenient when marauders from the Crystal Dimension kidnap Finn for their great master and covering Finn with a Crystal.
- Trivia
- It is revealed in this episode that Jake has a brother named Jermaine.
- Cultural References
- Episode Connections
Season two, episode nine: The Other Tarts
- Synopsis
- Princess Bubblegum assigns Finn and Jake a dangerous assignment: carrying rare tarts for a Candy Kingdom ceremony. They decide to protect the tarts using various deceptions and tricks, but discover the difficulty of completing their job the hard way.
- Trivia
- The part where Bubblegum admits that she lied to Finn about the tarts as well was cut out of the UK version for unknown reasons.
- Episode Connections
- In "The Red Throne", after Cinnamon Bun is hit in the face with fire, it causes him to become fully cooked, making him smarter and more well-spoken. Princess Bubblegum says his limited intelligence is due to the fact that he is "half-baked" in this episode.
- Production Notes
- This episode was previously titled "Death by Dessert."
Season two, episode ten: To Cut a Woman's Hair
- Synopsis
- An ugly Tree Witch asks Finn and Jake to get princess hair to help cure her baldness and make her beautiful. When Finn declines, she sits on Jake and threatens to suck him into her "bottomless bottom," Finn goes along with giving her a lock of hair.
- Trivia
- Finn removes his hat for the first time in the series.
- LSP actually has very short hair.
- PB loves spaghetti.
- This episode confirms that Princess Bubblegum's hair is also made of bubblegum.
- Episode Connections
- The wad of Princess Bubblegum's hair that Finn gave to the Tree Witch was returned to him and is seen again in "What Was Missing" and "Incendium."
- Lumpy Space Princess appears to have run away from her parents, as she is seen living in the forest instead of back in Lumpy Space, but the reason why is revealed in The Monster.
- Cultural References
- The entire episode may be a reference to Alexander Pope's poem, "Rape of the Lock."
Season two, episode eleven: The Chamber of Frozen Blades
- Synopsis
- When the Ice King goes away to treat a sick Gunter, Finn and Jake perform a ninja stakeout of his lair to try and find proof he's captured another princess.
- Trivia
- In this episode, Finn was shown to have Cleithrophobia, it means fear of being trapped
- Cultural References
- This episode's title card is done in the style of martial arts movies from the 70's and appears at both the beginning and end of the episode. To go along with this theme, this is the only title card to feature the Cartoon Network Studios logo and the statement "produced in Burbank, California."
- There are strong references about the popular Japanese anime/manga Naruto: Shippūden
- The words fridjitsu which was based in ninjutsu
- The hand signals that both Finn and Jake use are a reference to Hand Seals from Naruto, used to channel chakra and create different jutsu, or elemental attacks.
- When Finn refers to Jake as his "shinobro" this is a reference to the Japanese word for ninja, which is "shinobi."
- The Ice Ninja manual that Finn and Jake find has the Japanese kanji 氷忍者 on the cover, which translates to "ice ninja."
- Production Notes
- In one version of the episode's storyboard, Gunter's offspring was going to be a hybrid Ice King/penguin creature; however Adam Muto explained that he originally drew a glowing kitten, but Thurop Van Orman wanted it to be an Ice King/Penguin offspring, which they thought would be a "cool gross-out moment." Cartoon Network vetoed the idea and it went back to being a kitten.
Season two, episode twelve: Her Parents
- Synopsis
- When Lady Rainicorn's parents come to visit, Jake fears they will be full of hatred due to past difficulties between their races. To appease them, Jake pretends to be a Rainicorn and tries to get Finn's assistance. This threatens their friendship in the process.
- Cultural References
- When Lady Rainicorn's parents are looking at Finn and Jake's house, an object similar to a Nintendo Entertainment System is seen to the left of Finn.
- Production Notes
- This episode was previously titled "Meet the Parents."
Season two, episode thirteen: The Pods
- Synopsis
- Finn takes up a quest from a dying knight to protect three magic beans: two good, one evil. But when he and Jake decide to plant the beans to eliminate the evil once and for all, will they be able to figure out which is which in time?
- Trivia
- Finn misspells "allergies" as "allerjies."
- Jake was seen eating chocolate ice cream even though he mentioned in "Slumber Party Panic" that chocolate can kill him.
- Cultural References
- Storyline Analysis
- Finn accepted a quest to guard the beans from ever being planted. Whether he thought it through or not, he had agreed to sit by the beans for an indefinite amount of time. He was saved from this by taking Jake's advice to plant the beans, technically causing Finn to fail the Gnome Knight's quest.
- Episode Connections
- In "Wizard" Finn also agrees to take on a lifelong quest for the good of the world, but without realizing what he was agreeing to. In this episode he consents knowing what he is getting into. He also does this in "Henchman."
Season two, episode fourteen: The Silent King
- Synopsis
- After Finn deposes the spank-happy king of Goblins, he becomes the king of goblins to prevent strife. But they and their strange rules prove not to his liking.
- Trivia
- The idea of Finn merging with Jake is from an unproduced first season episode "Jakesuit."
- The number "041010" appears in this episode, on the plate of an overturned car that appears briefly during the goblin riot scene.
- Episode Connections
- Finn uses Jake as a suit once again in the Season 5 episode "Jake Suit".
- Cultural References
- When Finn wears Jake's body like a suit, to fight Xergiok and the earclops army, they use an ability similar to Marvel superhero Hulk's Thunder Clap.
- The way the goblins are born from a mud pit is very similar to how orcs are born in The Lord of the Rings.
- Production Notes
- This episode was previously titled "Finn the King."
- The storyboard for this episode contains what would have been the first mention of the Mushroom War in the series. It is seen when Gummy is reading from the rule book; however, this line was cut from the actual episode.
Season two, episode fifteen: The Real You
- Synopsis
- Finn, who has to give a speech at Princess Bubblegum's science barbecue, seeks a quick fix to make himself smarter. However, he does so by getting a pair of glasses with very strange effects.
- Trivia
- While setting the grill, Princess Bubblegum's T-shirt has a rainicorn on it.
- During the zoom scenes, a full view of Earth is shown for the first time. The same image appears on Rebecca Sugar's promotional art for the episode.
- Finn's trademark gold sword was destroyed in this episode.
- In this episode Princess Bubblegum calls Finn "Finny" for the first and only time in the series.
- Cultural References
- The worms' "Theoretical Fightonomics" class discusses who would win in a fight between Friedrich Nietzsche's Übermensch (also called "Superman") and Mandroid, an apparent reference to comic book nerds' enjoyment of discussing "who would win" scenarios.
- One of the worms wearing glasses and charging with a ruler says "Excelsior!" which is the catchphrase of Stan Lee. He used it at the end of every "Bullpen Bulletins" section in Marvel Comics.
- Errors
- In this episode, Jake had a hard time whistling, but in the episode "The Jiggler," he whistled along with the song "Baby" perfectly.
- Production Notes
- This episode was previously titled "Born to Die" and "The Smartering."
Season two, episode sixteen: Guardians of Sunshine
- Synopsis
- Finn and Jake trick BMO into letting them into the video game called Guardians of Sunshine, where they attempt to defeat an unbeatable video game in a 3-D digital environment.
- Trivia
- The frog character is named Sleepy Sam, but he is referred to repeatedly as "Silly Sam."
- Cultural References
- Bomba may be a reference to the Super Mario Bros. video games. The bomb-type weapon in Super Mario Bros. is called a Bob-omb or Babomb.
- Production Notes
Season two, episode seventeen: Death in Bloom
- Synopsis
- After killing Princess Bubblegum's Princess Plant when left to take care of it, Finn and Jake have to go to the Land of the Dead in order to get its soul back.
- Trivia
- There are 20 different police cars littering the underworld.
- Episode Connections
- In the end of this episode Peppermint Butler tells Finn and Jake that he wants their flesh as payment for helping them. This is the second time one of the candy people craves flesh, with the first being Starchie in the episode "Slumber Party Panic," where he says that he cannot help it and continues to chew on Finn's leg.
- Cultural References
- When Jake drinks water from the river, he forgets who he is. This is a reference to the river Lethe in Greek mythology.
- While Jake receives the Kiss of Death, his leg is bent behind him in a way that was used by women in old cinema and TV kissing scenes. This act is meant to signify the woman's enjoyment of the kiss.
- Production Notes
Season two, episode eighteen: Susan Strong
- Synopsis
- Finn is excited to discover a tribe of "humans" living underground, but gets more than he expected when he tries to teach one of them about the surface world.
- Trivia
- In this episode it is revealed that not only the inhabitants, but all the buildings and even the ground in the Candy Kingdom are edible.
- Besides playing a viola, Jake also plays a guitar.
- The Nuclear Bunkers the Hyoomans live in are similar to the Fallout series' Vaults, which are also used to protect the inhabitants from Nuclear weapons. However, most of there were used in various experiments. One such vault, Vault 12, was designed not to close properly in war. As a result, it's population of humans turned into Ghouls, which may suggest the "Fish People" being created in a similar way - from exposure to radiation due to the Great Mushroom War. However unlike the Hyooman tribe, the ghouls of vault 12 left the vault to settle in a place they called, Necropolis.
- This is the last episode before Finn turns 13 years old.
- Episode Connections
- There is a Scientific Parasite in Princess Bubblegum's purse, which was seen first in "His Hero."
- When Finn and Jake take Susan to the surface, she gets scared of the grass, and Finn tells her, "Grass can't hurt you." However, this is ironic, because the Grass Sword he bought in "Blade of Grass" is ultimately what caused him to lose his right arm in "Escape from the Citadel."
- Cultural References
- The hatch and the title card depicting Finn and Jake looking down it are references to the TV series Lost.
- The storyboard originally contained a scene labeled the "Lost pan" that featured numerous references to Lost, including the frozen wheel, the Swan station computer, and Locke's wheelchair; however, this scene was cut from the episode.
- Production Notes
Season two, episode nineteen: Mystery Train
- Synopsis
- On a train ride to Finn's birthday present, he and Jake are thrust into a high-speed who-dun-it where suspects are being murdered one by one.
- Trivia
- There is a hidden pancake somewhere in this episode.
- When Jake transforms into the conductor, his eyes are the conductor's shoes and the conductor's left eye is always closed because that's Jake's tail.
- Finn is officially 13 as of this episode.
- There are multiple clues throughout the episode that hint at the truth:
- When Colonel Candy Corn was trying to name his enemy he doesn't specify the gender.
- The Conductor enters the passenger car to wish Finn "Happy birthday"; however, the Conductor should not have known Finn's name.
- When the Conductor skates away after giving Finn his birthday regards, there is a pink smudge on wall where the Conductor's hand was, evidence of the paint used to disguise Jake.
- Each time a passenger is murdered, the Candy People remain uncharacteristically calm, but in "Slumber Party Panic," it was revealed that candy people would explode if scared.
- When the Conductor says it will be a bumpy ride, he uses a voice very similar to the deep voice Jake has used in previous episodes.
- The Conductor says that he heard someone say he was creepy, but Finn only told Jake, and that was in his normal, not very loud voice.
- When the Conductor enters the passenger car on a skateboard, he states that he is "cool and awesome." Once he leaves, Finn disagrees, but Jake hastily replies "No way, man! The conductor is cool and awesome."
- Episode Connections
- Cultural References
- This episode is similar to several mystery stories, particularly Murder on the Orient Express by Agatha Christie.
- This episode shares many elements with the David Fincher film The Game, a movie about a man who finds himself in a series of life-threatening situations, only to find that it was all an elaborate birthday present set up by his brother. The most notable common element being the scene Finn and Jake are saved from falling to their deaths by gelatin, mirroring the scene where Michael Douglas's character's suicide attempt is thwarted when he lands on a giant inflatable at what turns out to be his own birthday party.
- Production Notes
- This episode was previously titled "Murder Train."
- Promo art by Kent Osborne.
Season two, episode twenty: Go With Me
- Synopsis
- Jake and Marceline both give Finn advice for asking Princess Bubblegum on a date.
- Trivia
- This episode reveals that Princess Bubblegum's first name is Bonnibel.
- According to Finn, when Jake is angry, he eats spaghetti to calm down. This is proven later in the episode.
- Episode Connections
- Cultural References
- Before the movie begins, there is a box of popcorn and a hotdog dancing, which resembles the Let's All Go to the Lobby song which used to be shown in theaters before the start of the movie.
- Marceline's haircut is similar to Skrillex's haircut which is used by many celebrities.
- Production Notes
- This episode was previously titled "Masters of Romance."
- Princess Bubblegum was meant to go with Finn in the original synopsis, but the idea was dropped.
- Promo art by Tom Herpich.
Season two, episode twenty-one: Belly of the Beast
- Synopsis
- Finn and Jake go inside the belly of a monster to rescue a bunch of bears who have made its stomach their new party cave.
- Trivia
- Party Pat was based on Pat McHale, previous creative director for Adventure Time and "Pen's right-hand man."
- Cultural References
- The bears resemble Care Bears as they both come in different colors and have pictures on their stomachs.
- Episode Connections
- Production Notes
Season two, episode twenty-two: The Limit
- Synopsis
- On a mission to save soldiers of Hot Dog Princess, Finn and Jake go inside a massive maze where wishes can be granted and where Jake's stretching powers are pushed to their limits.
- Trivia
- In this episode it is revealed that hot dog people are immune to poison.
- Cultural References
- Jake's idea to stretch out to avoid getting lost is a reference to the idea of the Greek hero Theseus who used nothing but string to also avoid getting lost in the Labyrinth.
- Episode Connections
- The Ancient Psychic Tandem War Elephant returns in the Season 6 episode "Furniture & Meat", still in Finn and Jake's possession. He is later given freedom to wander the world in "Something Big".
- Jake loves to wish for a sandwich as he also wishes for one from Prismo in "Jake The Dog", though Prismo denies him and explains he can just make him one.
- Jake also makes a sandwich appear instead of what Finn wants in "Graybles 1000+", when using the Thought Cannon Wand and accidentally thinking of a sandwich.
- Production notes
- This episode's original name was "Wish Upon a Maze."
- Promo art by Jesse Moynihan.
Season two, episode twenty-three: Video Makers
- Synopsis
- After discovering government warnings prior to movies for their film club, Finn and Jake decide to make their own, but get into a fight over the direction of their film.
- Trivia
- All of the main characters appear in this episode except Ice King.
- When Finn was pouring drinks he poured several different drinks with the same pitcher.
- The pitcher has an inscription of Futhorc (Anglo-Saxon) runes on it. According to the Runic code it says, "Cup of Many Ale(s)."
- Cultural References
- The phrase "Check Please" is a punchline used in many TV shows and movies, usually after something off-beat happens.
- Episode Connections
- Shelby's punchline and his apparent priestly profession reappears in the fifth season episode "The Pit".
- Production Notes
- This episode was previously titled "Dueling Videos."
- Promo art by David Smith.