After SpongeBob wakes up in a strange city with no memory of who he is, he gets in trouble with a local gang as he walks around blowing bubbles to cheer himself up.

Zane, who is a member of Sensei Wu's team of ninja warriors, has no memories He wants to find answers about his past, but getting them might put the whole team in danger, and, indeed, when fellow ninja Kai attempts to help Zane, he finds himself in trouble.

Mr. Nobody is an invisible nobody from nowhere though he thinks he used to be a somebody, but he can't really remember who, what, where, or when until Mr. Happy decides he has to help him.