>>118024728The Primordial Evil that Aku was a splinter of is trying to reform itself; individual fragments are racing each other in an attempt to dominate the core of the reformed being.
Into the Unknown - The first world you encounter and things start off as a seemingly normal, peaceful world; things like Clarence, EEnE, and Craig of the Creek but trying to move on requires that you head into The Forest that surrounds these small towns. A forest with a Beast in it.
Those Meddling Kids - Pretty much all of the Scooby-Doo knockoffs and villains in one world with the big boss behind it being Nibiru.
Quest World - Dr. Zin has created an army of giant insects through experimenting with that world's non-sentient Fragment. Unlike most worlds, the bigger problem isn't the Fragment, but the race between Dr. Zin's rivals, both good and evil with the latter including those outside and inside his colleagues at the Guild of Calamitous Intent.
Treasures of the Worlds - Pirates of Dark Water, Galtar and Golden Lance, pretty much any minor HB property that revolves around other worlds and magic items, all under assault from the Dark Dweller and Dark Water. If not for all those magical items, this world would have fallen long ago since the Primordial Evil's influence is more widespread here than anywhere else; it's the world most warped and twisted by evil but not the one with the most powerful Fragment since there's one more world whose Fragments haven't been stunted and splintered by the Treasures of Rule.
Ego Trip - The final, longest and most difficult world begins with Dexter/Townsville and jumps through time into Samurai Jack. In this world, Aku put too much of himself into hurling Jack into the future and fell dormant for ages until he passed into legend. During that time, another, lesser fragment arose as Him; the fight between the heroes and Him awakens Aku. A time travel mishap also throws the heroes into Primal for a bit.
More later if this sticks around.