Mermaid Man and Barnacle Boy III:
This episode starts out with the narrator of the show introducing the superheroes Mermaid Man and Barnacle Boy. Then it shows them as old, and then they start packing their stuff to go on vacation. So now SpongeBob and Patrick watch over the Merma-lair. However, at one point, they find the superheroes' arch enemy, Man Ray. But Man Ray convinces them that he is good, so they let him go. So now he is free, but he has a tickle belt on him, so he fakes his way through goodness school for it to be taken off. Needless to say it works and he is really free now. So he tries to rob a bank, but fails because it turns out the tickle belt and SpongeBob's goodness lessons actually worked and set Man Ray straight.