Nicktoons Unite!, also known as SpongeBob SquarePants and Friends: Unite!, is a 2005 video game featuring characters and levels from spongebob, Danny Phantom, The Fairly OddParents, and The Adventures of Jimmy Neutron: Boy Genius. It has spawned three sequels entitled Nicktoons: Battle for Volcano Island, Nicktoons: Attack of the Toybots, and SpongeBob SquarePants featuring Nicktoons: Globs of Doom. Tom Kenny, David Kaufman, Tara Strong, Daran Norris, Susanne Blakeslee and Debi Derryberry reprise their roles from their TV series.
One morning, when SpongeBob leaves his house, he sees that Plankton has taken over Bikini Bottom and used multiple tank-like vacuums to suck up some of the town's citizens. He sees Goddard coming out through a portal and receives a message from Jimmy. He follows Goddard through the portal to Jimmy's lab and meets Jimmy Neutron, Danny, and Timmy. Jimmy tells his interdimensional guests about his new invention, the Universe Portal Machine. As he says, it allows people to travel to other worlds. But Prof. Calamitous has been spying on him, stole his idea and created his own Portal Machine. With it, he brought Plankton, Vlad Plasmius, and Mr. Crocker to his dimension. They formed a syndicate and proceed to steal energy from all the worlds. Since our heroes don't know where Calamitous' lair is, they start with saving all of their worlds first.
They go to Amity Park first and find Vlad. Vlad reveals that he uses his ghost-portal to steal ghost energy from the Ghost Zone. Vlad has also captured Danny's parents. Then, he sends the heroes to the Ghost Zone Prison. The Nicktoons survive in the prison, and defeat Walker. They break out of the prison through a portal and end up in Fenton Works. They see many Amity Park civilians possessed by ghosts, but manage to push them out. The Nicktoons go to the Amity Park Graveyard, which is a shortcut to Plasmius' castle. When they go in, Jimmy realizes that there are generators that help Vlad keep the portal open. They find the generators, and destroy them, shutting off the portal. When they find Vlad, the Nicktoons defeat him and save Jack and Maddie Fenton without them noticing the Nicktoons. They also find out that the Syndicate is building something.