they're exist to fit more things that can't fit into both the Ultimate Crossover Movies and Spin-off alone, to make Ani-toonspiracy Pooh's Adventures(as concept) done right

• "Episodes from Traverse Town": to fit anyone in traverse town that can't fit into the Spin-off, as well to fit Digimon data squad characters and Lin from the Mummy: tomb of dragon emperor
• one that's to fit Scrappy doo and Scooby dum as well to use another Pokémon universe
• Countdown trilogy: to fit Heroes characters outside Hiro Nakamura or Emile Danko as well other Metal Slug characters and Sonic characters outside Sonic and his friends
• unnamed one that's made to tell the story about Extreme Ghostbusters' job during their ACME membership(to fit even Slenderman there)