On a seemingly normal day, SpongeBob and Squidward are on their way to work when huge asteroids started raining down on Bikini Bottom. A huge drop of glob falls on Squidward, causing the top part of his face to turn orange. He then becomes a cyclops of sorts. He then becomes a zombie, chasing SpongeBob around the perimeter of someone's house until Patrick intervenes. Jimmy Neutron then arrives to take them to the Mawgu lair. Soon, the gooey creatures spawning from the asteroids start taking over Bikini Bottom.
SpongeBob and Patrick explore the vast Mawgu lair, where they meet Danny Phantom again, then meet Tak and the new Evil Syndicate composed of Technus, Beautiful Gorgeous, Tlaloc, and Plankton. Zim and Dib then arrive, with Zim joining the good guys, and Dib joining the Syndicate. They make a plan to stop the gooey creatures, identified as Morphoids, when the Wise Old Crab arrives to inform them about the technology in the lair. Jimmy is able to figure it out, and fits everyone with weapons fitting their personality: Jimmy received some sort of helmet and a tennis racket, SpongeBob got a bubble blower, Danny received a device that allowed him to partly clone himself, Tak was given a staff, and Zim received a plunger (or as he refers to it, "It is a Plunger of DOOM!!!"). Meanwhile, on the evil side, Technus received an arm blaster, Plankton was given a hammer that allowed him to grow (about to the height of Jimmy, Zim, and SpongeBob), Tlaloc received a pouch of magic potions, Dib was given a gun-like balloon launcher, and Beautiful Gorgeous received a heart-shaped bullhorn.
They go through Bikini Bottom, where the group battles an army of Morphoids, free Gary and Patrick from the goo, and finally confront the corrupted Bubble Bass, who has grown to enormous size. They defeat this new menace by feeding him Krabby Patties (which ironically turned him into a zombie in the first place, a drop of Morphoid goo fell on it). SpongeBob is then doused in goo. At the lair, the Wise Old Crab informs them that a huge robot (known as the Vessel of Portentia) is hidden in the Mawgu Lair, and requires four special components to power it up.
The next world they go to is Zim's town, where GIR has been corrupted by a taco. They manage to free Ms. Bitters, Gaz, and Professor Membrane, then face the corrupted GIR, who has sprouted several mechanical tentacles and has the ability to summon Morphoids from his very being. He soon tires out of attacking the heroes and is then beat up out of being possessed. They retrieve the first piece of the Vessel, while more goo falls on SpongeBob, and at the lair becomes a vessel for the leader of the Morphoids.
They venture to Amity Park, where Morphoid asteroids rain on the citizens, and in the process freeing the Ghost Dog. Not soon after, a blob of goo falls on its head, resulting in him too being corrupted. He goes on a rampage through town. After freeing Dash, Tucker, and Jazz, they fight the ghost dog at a power plant, where the goo falls off of Ghost Dog and onto SpongeBob (once again). They gain another piece of the Vessel, and it is here that he becomes a puppet of sorts for the Morphoid supreme leader, Globulous Maximus who has just revealed himself.
They then head to Retroville, where the goo has turned Jimmy's girl-eating-plant into a monstrous giant and prepares to eat Cindy whole (expectedly). After defeating several more Morphoids and freeing Carl, Cindy, and Sheen, they fight the girl-eating-plant at the mall. After being consumed several times (and beating up the plant's fragile heart), the team manages to defeat the girl-eating plant and yet another pile of goo falls on SpongeBob. The third piece of the Vessel is retrieved, and Globulous once again talks through SpongeBob.
Finally, they go to Pupununu Village and retrieve the fourth and final piece while Globulous talks through SpongeBob for the fourth and final time.
The team quickly inserts the pieces of the Vessel of Portencia and then speeds toward space, where they confront and defeat Globulous Maximus, who is a large asteroid himself with floating arms and a primary eye (along with several nonfunctioning others). After Globulous is defeated, the Evil Syndicate betrays the rest of the group, taking over the Vessel of Portencia and ejecting the heroes from the robot. Globulous Maximus then opens up to the heroes, where he reveals that he was created at the beginning of the universe, the Big Sneeze (aka the Big Bang), thus making him a huge orange booger. SpongeBob then asks why he was destroying worlds, with Globulous replying that he was distasteful of his form and thus took out his anger on others. SpongeBob then tells him to embrace who (or what) he is, and they throw Krabby Patties in his mouth to make him feel better. The group then wonders how they will stop the Evil Syndicate from taking over the Earth. Globulous states that he has an idea, as he morphs into a huge, orange, and cycloptic version of SpongeBob. Depending on the player's actions, one of two endings will occur.
In the "good" ending, achieved by simply defeating the final boss, Globulous and the heroes manage to defeat the Vessel of Portentia on the moon, and it explodes in space, leaving the villains floating around. Globulous returns the heroes to Earth, and says that he will right the wrongs in the universe by taking the moniker "SpongeGlob". The heroes bid him farewell, and SpongeGlob blasts off into space. Meanwhile, SpongeBob sneezes, and the goo finally exits from his body through his many holes. Patrick compares this moment to the beginning of the universe where SpongeGlob was born, while the Wise Old Crab then summons a typical "The End" sign.
In the "alternate" ending, which requires having a second player take control of the villains' robot on a file that hasn't already been completed (as getting the "good" ending will lock the file into that ending) and defeating the first player, Globulous, the villains are shown to have captured Globulous in a giant glass jar, with the credits rolling immediately afterwards.
I can turn into a skyscraper!
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Jimmy Neutron, Danny Phantom, SpongeBob SquarePants, and Patrick Star were the only characters that appeared in all four games, while Danny and SpongeBob were the only characters playable in all four games.
This was the second game in the series since Nicktoons Unite where Patrick Star is not a playable character.
This was the third Nicktoons crossover game to feature Plankton.
If the player exits the hub or the loading is not complete, the game file will become corrupted.
Plankton is the only original syndicate member from the first game.
This was the only "NickToons Unite!" game where SpongeBob does not use his karate gear as his weapon.
Although, his glove can be seen as a power-up.
This was the second time in a row that GIR appears in a Nicktoons Unite sequel.
The goo in the game is similar to the Nickelodeon logo goo.
This was the only game in the series that did not feature any Fairly OddParents characters.
This is presumably the final time SpongeBob and Patrick have met their inter-dimensional friends and went on an adventure with them.
This is the last SpongeBob game to have a PS2 release, as PS2s and PS2 games are no longer manufactured.
This is the first (and so far, only) time Squidward has met Jimmy Neutron. This is not the first time they have been seen in a video game together, the first time was Nicktoons: Battle for Volcano Island.
In the Bikini Bottom levels, Bubble Bass is heading towards the Krusty Krab, at the end of the first level SpongeBob and Beautiful Gorgeus are seen at the Chum Bucket, it is unknown why they didn't just cross the street to get to the Krusty Krab.
SpongeBob and Plankton have many of the same lines in the game.
In the first Bikini Bottom level, some of the boats say "Y2K Shell."
In the Bikini Bottom hub, there is a strange texture around and on top of Patrick's home. The texture seems to be a mix of eyes, Patrick's shorts, and Patrick's skin.
This game takes place after the episode "Plankton!" because SpongeBob knows Karen.
This takes place after the episode "Band Geeks," as evidenced by the fact that Mr. Krabs, SpongeBob, Sandy, Plankton, and Patrick had never seen a human before this episode, as referenced when Patrick said "These are some oddly looking fish." and SpongeBob saying "Maybe we're in one of those toxic waste dumps."
This takes place after the Jimmy Neutron and Fairly OddParents crossover, Jimmy Timmy Power Hour. As referenced by Jimmy and Timmy's knowledge of each other. As well as Jimmy's knowledge of Cosmo and Wanda. Also, Jimmy refers to Fairy World magic as "the power source from the game." Cindy also met Timmy in that episode, which is referenced at the end of Nicktoons Unite!.
It might also take place after Jimmy Timmy Power Hour 2: When Nerds Collide! because in that episode Mr. Crocker and Professor Calamitous had no interaction with each other after Professor Calamitous hit the "Welcome to Dimmsdale" sign when Mr. Crocker was putting up his birthday sign.
This takes place after Jimmy Neutron's Professor Calamitous, I Presume, and Danny Phantom's Bitter Reunions. As these were the two episodes that Jimmy met Calamitous and Danny met Vlad.
This takes place after "Help Wanted" because SpongeBob knows Mr. Krabs.
This takes place after "Scaredy Pants" because SpongeBob knows the Flying Dutchman.
This also most likely takes place after "Shanghaied" because it seems like the Flying Dutchman knows him more and is also afraid of him and SpongeBob seems familiar with the Dutchman's ship.
This takes place after The Fairly OddParents episode "That Old Black Magic" because Timmy has been to Fairy World.
This takes place after The Fairly OddParents episode "Inspection Detection" because Timmy knows Jorgen.
This takes place after the Oh Yeah Cartoons! short/Fairly OddParents' pilot, "The Fairly OddParents!" because Timmy knows Cosmo and Wanda.
This might take place after The Fairly OddParents episode "Abra-Catastrophe!" because the exterior of Crocker's fortress looks similar to his fortress in that episode.
This takes place after the Danny Phantom episode "One of a Kind" because that is the episode where Danny met the Box Ghost and Skulker. (Skulker appeared in the episode below.)
This takes place after the Danny Phantom episode "Prisoners of Love" because that is the episode where Danny met Walker. He has also been to the Ghost Zone Prison before in that episode.
Because of that episode, this game is also after the episode "Mystery Meat" because that is the episode Danny met The Lunch Lady Ghost and she was in "Prisoners of Love." Same with the episodes "What you Want," "Attack of the Killer Garage Sale," and "Parental Bonding" with the characters Desiree, Technus, and Princess Dorathea.
This takes place after "Frankendoodle" because that is the episode where SpongeBob met DoodleBob, which is used as an attack in Nicktoons Unite!.
Due to this, this video game also takes place after "Bubblestand."
This game takes place after The SpongeBob Movie: Sponge Out of Water because SpongeBob is not surprised when he sees humans and Plankton doesn't know what Teamwork is in that movie and in this game he works with a team.
The game continually switches between day and night in some of the levels. When SpongeBob and Beautiful Gorgeous travel to Bikini Bottom, it was day time. But when Jimmy and Plankton were at the Bikini Bottom Dump it was night.
In the 2nd Amity Park level, there is a glitch from when the player pulls the three Switches the fan won't work and the player will get stuck on the level.
In the second Bikini Bottom level:
In the dump:
Eugene H. Krabs' mattress is seen even though he supposedly took it back home after "The Lost Mattress." Although this could have been someone else's mattress, it is unlikely because it had money in it and most people, other than Mr. Krabs, don't put their money in a mattress.
The player(s) can see (and go into) Mr. Krabs and Plankton's childhood hangout spot from the episode "Friend or Foe," but, it has a hole at the top of it, this is an error because in the real version of the story neither Plankton nor Mr. Krabs were shot out of the roof. When the player(s) go(es) inside it looks different than from the episode.
When the player(s) get(s) off the bus the player(s) can see the characters appear right before the bus does to let them off.
In the Theater, when the player(s) enter the bathroom and enter one of the stalls a fish runs out and runs off to the wall, he is just running in place at the wall.
During the cutscene before the second Bikini Bottom level, Plankton says that the Chum Bucket is in danger, but, the Chum Bucket is not seen in the next level.
In the first Amity Park level, when the player(s) go to the top of Casper High and look at the baseball field, the giant morphoid monster that appears later is not there.
In the first Bikini Bottom level, after the player(s) pass(es) the 3 houses, there is a sign that says "Bikini Bottom 50 miles." This is inaccurate because SpongeBob, Patrick, and Squidward live in Bikini Bottom.
In the first two Bikini Bottom levels, in the gameplay, the buses don't have the "periscope."
In the second Bikini Bottom level, the Reef Cinema is in town, but in the series, it has a path leading to the cinema, which separates it from the town.