Season two, episode twenty-four: Mortal Folly
- Synopsis
- When the Lich is accidentally freed from its prison in Princess Bubblegum's Castle, Finn and Jake must head forth to stop it from regaining its full power, all while being pestered by the Ice King to give him their blessing to marry Princess Bubblegum.
- Trivia
- "Mortal Folly" can mean "a foolish death" or "a fatal and foolish act." This could be referencing how Ice King almost foolishly killed Princess Bubblegum.
- Ice King was in the presence of the Lich without the protection of Princess Bubblegum's gems. It is implied that he was able to do this because of his crown.
- Outside the Lich's lair on a pole is the number 81012.
- Finn can move the six fingers in the gauntlet, but he only has four fingers. The gauntlet and its usage in the episode may be a reference to Michael Moorcock's character Corum Jhaelen Irsei, who at one point possessed an artifact Hand of Kwll. Much like its Adventure Time counterpart, the Hand looked like a jeweled right-hand six-finger gauntlet that could at times act of its own accord, and it was given to Corum to help him avenge his kin and vanquish the Chaos Gods.
- Episode Connections
- The title art looks identical to the explosion let off from the bomb in "Jake The Dog."
- The well in the Lich's lair looks like the same mutagenic material that turned Farmworld Jake into the Lich in "Jake the Dog."
- Production Notes
- This episode was previously titled "This Mortal Folly"
- Promo art by Jesse Moynihan.
- Episode Connections
- The Lich would not have been released if Princess Bubblegum had not taken Finn and Jake to check on the Lich's prison, due to the fact that the snail got there via Finn's backpack; her vision was itself a self-fulfilling prophecy.
Season two, episode twenty-five: Mortal Recoil
- Synopsis
- Princess Bubblegum recovers from being dropped in the Well of Power by the Ice King; however, she is altered and her condition leads to an unlikely final showdown with one of the greatest evils in order to save all life in Ooo.
- Trivia
- When the possessed Princess Bubblegum sets her room on fire, the flames in the background seem to have faces.
- Episode Connections
Season two, episode twenty-six: Heat Signature
- Synopsis
- Marceline plays a prank on Finn and Jake by making them believe they're vampires, but it goes too far and escalates when they're manipulated by her ghost friends.
- Trivia
- The ghosts' chanting is actually a backmasked message to creative director Pat McHale. If played backwards, the ghosts say, "Farewell Pat. Good luck in New York. Come back soon."
- Cultural References
- The tagline for Heat Signature is "Under the ocean no one can hear you die." This is similar to the tagline of the 1979 horror film Alien: "In space, no one can hear you scream."
- This episode also makes 2 references to the Iron Maiden album "Piece of Mind." Finn and Jake are rescued from falling to their certain deaths by an invisible Marceline and think they're flying (Flight of Icarus) and they almost get their brains stolen (Die With Your Boots On).
- Production Notes
- This episode was originally titled "Blood Drive," referring to the address of the ghosts' mansion (25 Blood Drive).
- Promo art by Tom Herpich.
Season three, episode one: Conquest of Cuteness
- Synopsis
- Finn and Jake must defend their home from the Cuties, a tiny race who believe themselves to be evil, destructive invaders.
- Trivia
- Even though BMO is genderless, Finn calls it "m'lady."
- It is revealed in the book: Righteous Rules for Being Awesome, that Jake ate his Everything burrito after he buried it.
- This is the only episode where Finn sleeps under a blanket without his sleeping bag.
- Episode Connections
- It is revealed that Jake has a sword of his own. He was seen using the sword in the beginning of "Tree Trunks," but it was not confirmed that it was his.
- Cultural References
- Cute King yelled out "Bravest warriors!" This refers to Adventure Time creator Pendleton Ward's earlier cartoon Bravest Warriors.
- Production Notes
Season three, episode two: Morituri Te Salutamus
- Synopsis
- The duo choose to partake in gladiatorial combat against the Fight King's ghost warriors, but Finn succumbs to bloodlust while Jake becomes obsessed in keeping a cool morale.
- Trivia
- The gladiators that Finn and Jake fight are marked by wounds that match the weapons of their partners.
- Cultural References
- "Morituri Te Salutamus" is roughly half of a Latin phrase commonly translated as "We who are about to die, salute you!" It is often associated with ancient Roman gladiators.
- Finn speaks Latin words in this episode, such as "abet" (a version of "be gone") and "eludere" (parry).
- Episode Connections
- Production Notes
Season three, episode four: Memory of a Memory
- Synopsis
- Finn and Jake enter Marceline's mind to awaken her from a sleep spell she had cast on herself, without knowing that they are being tricked by a person from her past.
- Trivia
- When Marceline entered Finn's memory, her fangs were not pointed. This might indicate that people's appearance changes in the mindscape.
- On the title card Jake has no ears.
- In Finn's memory of his old house, a picture is seen showing Margaret and many other dogs. This may mean that Finn and Jake may have (or had if they are still alive) more siblings other than Jermaine.
- Cultural References
- Episode Connections
- In one of the memories, Marceline and Ash are seen lifting a sofa in the Tree Fort which confirms her statement from "Evicted!" about how the tree was previously hers.
- Marceline's father appears briefly eating Marceline's fries, which is the event that sparked the bitterness between the two and the song Marceline sang in "It Came from the Nightosphere."
- The vulnerability of young Marceline in the post mushroom war period is seen in the flashback episodes "I Remember You,"Simon & Marcy," and this one, and can be indicative that Marceline has not always been immortal.
- Production Notes
- This episode was previously titled "Marceline's Mind."
- In a storyboard scene cut from the final production, when the Rag Wizard said they had to look inside Marceline's mind, Finn was initially going to cut open her head to look at her brain.
- "Memory of a Memory" Storyboard
- Storyline Analysis
- When Finn and Jake enter the first memory, the burning ruins of a city in the background and the derelict tank around Marceline are evidence that the Mushroom War occurred relatively recently or was going on at that time.
Season three, episode four: Hitman
- Synopsis
- The grounded Ice King hires a fire-manipulating hitman to attack Finn and Jake, without realizing the potentially deadly consequences.
- Trivia
- In this episode, Ice King demonstrated traits of Simon, going against Finn and Jake's wishes of being frozen, in order for them to stay alive. Ice King seems to do the necessary deeds in order for everyone to survive, similar to how he treated a young Marceline.
- When Finn and Jake are making sandwiches, on the close-up of Meat Man's meat, a small, yellow creature can be seen poking out of Jake's sandwich.
- Cultural References
- When the Ice King starts his computer to order a hitman, its start-up logo is a pear, a parody of the Apple logo.
- Episode Connections
- This is the first time anyone uses the word "boingloings," with the second time by Finn and Jake in the episode "A Glitch is a Glitch."
- Production Notes
- This episode was previously titled "Hitcapades"; this title referred to the Ice Capades, a long-running touring ice skating show.
- In the original storyboard, the Ice King tries to distract Scorcher by saying "Someone got hit in the nuts." instead of "Someone got hit in the boingloings."
- Promo art by Jesse Moynihan.
- "Hitman" storyboard
Season three, episode five: Too Young
- Synopsis
- The Earl of Lemongrab takes over the Candy Kingdom due to Princess Bubblegum's age regression, forcing her and Finn to try and get rid of him even if it means a life-altering decision.
- Trivia
- The room in which Lemongrab is seen eating is partly painted and filled with boxes, probably due to Lemongrab moving in.
- Cultural References
- The prank machine is a form of Rube Goldberg machine; an overly-complex apparatus that performs a simple task.
- Episode Connections
- In the part of the episode where Lemongrab asks Peppermint Butler where food comes from, Peppermint Butler replies, "My lord, food comes from Mars-" before Lemongrab yells and cuts him off. This may refer to Glob, which was stated by Finn to be a deity in "No One Can Hear You" and seen in Mars in "Sons of Mars."
- Production Notes
- An alternate version of the title card shows young Princess Bubblegum and Finn about to kiss.
- Promo art by Jesse Moynihan and Tom Herpich
- Storyline Analysis
- This episode brings to question Princess Bubblegum's actual biological age, as she is seen looking like her "19 year-old" self in the flashback where she created Lemongrab. The question of Bubblegum's age is answered in the season 5 episode "The Vault," where she is shown to appear as her "19 year-old" self even as the Candy Kingdom is being built, presumably a few hundred years before the events of the current series. Finn also exclaims in the same episode, "PB, you're like a bazillion years old. You're not freaking nineteen! What the heck?!" confirming that she had been lying about her age.
- Princess Bubblegum claims that something went wrong during the creation of Lemongrab, but she never revoked his authority in the Candy Kingdom or his right to the throne.
- This episode shows that Princess Bubblegum's age is based on her mass, not the length of her life. If she was originally eighteen, changing what age she appeared to be would not actually change the fact that she is eighteen.
Season three, episode six: The Monster
- Synopsis
- The king and queen of Lumpy Space ask Finn and Jake to bring their daughter back home. At the same time, they attempt to stop a "monster" from destroying a village.
- Trivia
- Lumpy Space Dad and Lumpy Space Mom have new designs in this episode, mainly by having crowns on their heads instead of just stars. Lumpy Space Dad also has new glasses and their body shape is changed.
- Cultural References
- The scene where Lumpy Space Princess was talking about the wolves cheating was inspired by the popular MTV show Jersey Shore, a show that Natasha Allegri is a fan of.
- Episode Connections
- As Finn and Jake are looking for Lumpy Space Princess, they pass a tree with two numbers on its trunk. The first (041010) appears on a license plate in "The Silent King," and the second (081012) appears on a wall in "Apple Thief."
- When Lumpy Space Princess was chased by the wolves, she tripped on a cliff and fell all the way down; however, she is capable of floating as seen in "Trouble in Lumpy Space." It was revealed in "Gotcha!" that she has somewhat of a limit to how high she can float.
- Production Notes
Season three, episode seven: Still
- Synopsis
- Ice King freezes Finn and Jake with a potion so he can force them to befriend him.
- Trivia
- In this episode, it is revealed that Finn's favorite food is meat loaf.
- Gunter loves to break bottles.
- Production Notes
Season three, episode eight: Wizard Battle
- Synopsis
- Finn and Jake enter a competition for wizards in disguise so they can prevent Ice King from winning the grand prize: a kiss from Princess Bubblegum.
- Trivia
- Power Shrieks are the most shameful form of magic in Ooo.
- Cultural References
- The Huntress Wizard's laser attack sound effect is similar to Star Wars's Blasters.
- Episode Connections
- Though Finn had wizard powers granted by Bufo in "Wizard," he lost his powers due to the robe being destroyed at the end of the episode, so he was no longer a wizard.
- Production Notes
Season three, episode nine: Fionna and Cake
- Synopsis
- Fionna puts up with the sudden courtship of Prince Gumball while taking advice from her partner Cake in dealing with guys.
- Cultural References
- Production Notes
- One of Marshall Lee's lines cut from the script was: "You're in a dress?! That's crazy, sonnn!"
- Prior to this episode's airing, the "Coming Soon" section of the Cartoon Network website stated that the episode takes place in "The Land of Aaa." However, this is not a term used by the creators of the show, though continues to see regular use in fanfiction.
- Promo art Rebecca Sugar.
- Storyline Analysis
- When Fionna tells Cake to take off the Ice Queen's crown to "not catch her crazy," it has serious implications as to what parallels the Ice King is drawing between the Ice Queen and his own history.
Season three, episode ten: What Was Missing
- Synopsis
- Finn, Jake, BMO, Marceline, and Princess Bubblegum must come together and play music as a genuine band in order to open the gate of the Door Lord and retrieve Finn, Jake, BMO, and PB's stolen items.
- Trivia
- When Adam Muto pitched the episode, he messed up. Reason being on why Finn said, "I'll get your kid back toy." The team thought it was funny and kept the flub for the actual episode.
- Cultural References
- Princess Bubblegum uses the British English term for musical beats ("quavers") as opposed to the American English term ("eighth notes"), hence Marceline's confusion.
- Episode Connections
- In "Bad Little Boy," Marshall Lee and Prince Gumball are shown to have the same type of relationship as Marceline and Princess Bubblegum.
- Marceline's singing to PB: "I'm gonna drink the red from your pretty pink face" in I'm Just Your Problem was no idle threat: she actually did this at the end of "Red Starved."
- Production Notes
- This episode was formerly titled "Door Jam."[1] It was a pun on the musical term "jam" and on "door jamb," however, the title was changed because the Adventure Time writers prefer not to use puns in episode titles.
- In the storyboards Jake got his pants by asking (and yelling) at Marceline to let him borrow her pants from her home, and Marceline says she misses it when Jake was afraid of her.
- "What Was Missing" Storyboard
- Promo art by Rebecca Sugar.
- Storyline Analysis
- Before Marceline realises what she is saying at the end of the song "I'm just your Problem", she is singing about wanting to make up with Princess Bubblegum even though she shouldn't, but she quickly changes the lyrics. It seems that despite their rivalry, they both care for each other a lot, but they are unwilling to admit it. PB also had saved the concert t-shirt that Marceline gave her.
Season three, episode eleven: Apple Thief
- Synopsis
- When Tree Trunks' apples go missing, she, Finn, and Jake descend into the dark side of the Candy Kingdom in order to find the thief.
- Cultural References
- The pig in the cellar is a reference to the 2001 movie "Hannibal" when Mason Verger trains boars to eat human flesh to take revenge on Hannibal Lecter.
- Episode Connections
- This is the first episode were Tree Trunks and Mr. Pig first met, the second time they appeared in "Dream of Love"
- In this episode it is revealed that Jake used to be a thug because he "did not know it was wrong; in "One Last Job" Jake's past crimes were explained further.
Season three, episode twelve: The Creeps
- Synopsis
- Finn, Jake, and some friends attend a dinner with a mysterious host. However, the host then reveals himself as a murderous ghost that will possess the body of one guest to kill everyone else. The night turns from a masquerade party into a terrifying whodunit as the guests start to get murdered one by one.
- Trivia
- Cinnamon Bun may have feelings for Lumpy Space Princess, as demonstrated when he says, "Now's my chance," when he hears that she has broken up with her boyfriend.
- A ruined skyline can be seen outside the mansion, which is an example of the effects of the Mushroom War.
- In the Adventure Time With Finn and Jake: Righteous Rules For Being Awesome book, it mentions it was Jake's birthday.
- Episode Connections
- The mysterious ghost lady who appears in the climax will appear multiple times after this, including as one of Finn's fears in "King Worm"; the truth of who she is will be revealed in "The Vault," which is Shoko.
- The mansion resembles the one in which Big Destiny and the Destiny Gang live in "Finn the Human," as well as the one in which the Bath Boy Gang live in "The Vault." This would make sense, since Shoko died on a mission for them, and later appeared there (though it could that be she was just following Finn to get him to return a thing to someone).
- Cultural References
- The ghost appearing near the end is drawn and painted in the style of traditional Japanese 'ghost paintings'.