Nicktoons: Attack of the Toybots starts off with Jimmy Neutron's enemy, Professor Calamitous, devising a new evil plot that involves using Fairy Gas (he feeds fairies from Timmy Turner's universe Krabby Patties from Spongebob's universe), and hundreds of mechanical, evil toys. Exactly what his plot is isn't clear; all we know up front is that he is competing in a game show called Real Genius where he is required to do something diabolical with themed ingredients (very similar to Iron Chef... yes, even the diabolical part).
When Patrick is sucked into the toy factory, it is up to Spongebob Squarepants to free him. Along the way, you will free up characters like Tak (this would be Tak's first appearance in a Nicktoons game), Timmy Turner and Jimmy Neutron. As you progress in the game, many other Nicktoons will become avalibale like Danny Phantom, Robot Betty (from "My Life As a Teenage Robot"), Zim (from "Invader Zim"), Stimpy (from "Ren and Stimpy") and Rocko (from "Rocko's Modern Life"). But just because you don't get to play as more characters doesn't mean that they won't make appearances. Calamitous seems to be trying to make toys out of characters from each of the Nicktoon universes. To do that, he captures the character and makes a Master Mold of them. As you go through the game, you will collect these molds, so you will see characters from many other shows like "Avatar: The Last Airbender" or "Rugrats" though it would have been nice to see a few more of the older shows like "Aahh!!! Real Monsters" or "Doug" (though there might be some legal reasons there since ABC/Disney eventually took over that license).
The game is very much a side-scrolling (though you have some 3D control) platformer. In fact, I would say if you have no patience for platformers at all, you will want to avoid this game with a passion. There were quite a few elements in this game that said "you know, platformers sometimes do this, so let's do it all the time" which got really annoying really fast. For example, early on, while in the factory, you have to jump between gears spaced vertically in different manners. Sometimes the spacing requires a double jump, sometimes just a single (and if you double, you die). The first time I came across this type of area, it took me no less than 50 tries to get past, I was very relieved to be beyond it. Unfortunately, it wasn't long before I found another area that was basically the same thing, except there were trampolines as the floor - not fun. Let's just say, it's a good thing there is no limit to the number of lives you have in Nicktoons: Attack of the Toybots.