Billy and Ed were on a "scavenger hunt" when they encounter a group of hostile ghosts. Thinking they're friendly ghosts with no place to live in, they let them in the WB studios, but they end up causing chaos.
A mysterious villain creates robot clones of SpongeBob, Patrick, Squidward, and Mr. Krabs as they start deleting various Nicktoons, leaving it up to the real SpongeBob, Patrick, Squidward, and Mr. Krabs, along with Jimmy, Squints, Shunky, and Leni (the only ones who didn't get deleted), to bring everyone back, defeat the robots, and find out who this mysterious villain is. (Yeah, sorta inspired by those nanobots from Jimmy Neutron)
Tired of the sitcoms Disney Channel airs, Gerrett, Rufus, Aye-Aye, Mabel, Wander, and Shank work together to make their own sitcom.
Woody, Shrek, Gru and some of his minions, Mohamed and Diesel, and Michelle and Luke were on a vacation when their boat crashes into a deserted island, and now they need to survive until help arrives.
Maybe, just maybe, a mega crossover with my ideas (not literally all of them, only like 25 of them). A mysterious villain has opened portals that appear in the main characters' location and brings them in one place, which is a strange temple in the middle of a jungle, and now they have to work together to escape.
(The Cryptids, Eric and Claire, Howler, The Miserable Adventures of Riley, Flytrap: Savior of All, The Arachnid Friends, The Cosmic Adventurea of Stella, The Molly Show, Sajoedri, USA, I Love Luke, Ryker and the Cicada, Fluke, Crimeopolis, The Urban Face Paints, The Expungers, The Dinosaur Crew, Holiday Forces, The Good Guys, Ocean Depths, Zard the Lizard, Little Hector, Kaylia: Space Avenger, Brothers and Monsters, Me and a Different Dimension, and lastly, The School-tastic Misadventures of Ray the Robot)
Woody: (reading) Dear person! Congratulations! You are invited to my awesome party! I have been a big fan of your show or game or book or whatever, and I want to get a chance to meet you in person. Just go to this address: 1537 Nutcracker Grove and you should see a forest, and yes, I live in a cabin in that forest. See you when you get there! Love, your biggest fan.
Kitrina: Here, let me tell you. (Clears throat) Howler and his friends, Fluke and Anna, The Cryptids, Eric and Claire, The Arachnid Friends, The Dinosaur Crew, Stella and Firgu, Ryker and Cindy, Jordan, Kimberly and Montana, and Little Hector.