Nicktoons Unite!, also known as Spongebob Squarepants and Friends Unite! in Europe, is a 2005 video game featuring characters and levels from Spongebob Squarepants, Danny Phantom, The Fairly Odd Parents and The Adventures of Jimmy Neutron: Boy Genius. It has spawned a total of 3 sequels, Nicktoons: Battle for Volcano Island (2006), Nicktoons: Attack of the Toybots (2007) and Nicktoons: Globs of Doom (2008). Even though this is the first official Nicktoons Crossover, this is not the first video game that included characters from more than one show. The game was released for the GameCube, Playstation 2, Gameboy Advance and Nintendo DS.
On one ordinary morning, Spongebob comes out of his house asking Gary what to do and then saying he will visit Patrick with him after meowing, but then hears that Plankton has taken over Bikini Bottom after him announcing that him and the Syndicate will rule Bikini Bottom. Then Plankton uses multiple tank-like vehicles to vacuum all of the town's citizens. Spongebob tiptoes to the side of his pineapple and suddenly Goddard teleports from a portal to the side of Spongebob's pineapple and petrifies him. Then, Spongebob receives a message from Jimmy Neutron through Goddard telling him about Plankton teaming up with villains from other worlds. Spongebob follows Goddard through the green portal to meet Jimmy Neutron, Timmy Turner and Danny Phantom. Since Spongebob is a sea sponge and is always in need of water, Jimmy uses his Neutronic Moisture Sealer to coat Spongebob in a coat of self regenerating moisture. Jimmy then explains this all started when Prof. Calamitous somehow managed to gain access to his project plans for his latest invention, The Universe Portal Machine, a device that lets us travel to other worlds. With the project plans, Calamitous created his own Universe Portal Machine. He took a journey to each world and met up with an ally from every world, Plankton, Vlad Plasmius and Denzel Crocker and then teamed up to form a Syndicate. Jimmy suspects that the four of the villains have a master plan in which they can all benefit from. They have combined their powers to form an army of Syndicate troops and are now stealing energy from each of the four worlds, our heroes don't know why they're stealing the energy, but whatever it's for, it can't be good! Since our heroes don't know where Calamitous' lair is, they began by rescuing their world’s first.
Spongebob Squarepants, Danny Phantom, Timmy Turner and Jimmy Neutron are the only four playable characters in the game.
In the console version a player can play with 3 CPUS or with a friend or two with the remaining computer(s). All characters have different types of abilities, which they can switch from. There are also things you will need a certain character's ability to do. For example, Spongebob can use Bubble Bombs to blow up pillars, Danny can perform Ghostly Wail on some types of glass, Timmy is able to use his Freeze Glove to freeze some waters and glowing blue objects and Jimmy is needed to use his Shrink Ray to shrink down certain items that you can use to jump on and reach new heights.