Mr. Krabs doesn't like Mystery that much, and wants SpongeBob to let Mystery go, although SpongeBob lies about Mystery having a stomachache. He is afraid for Mystery to go, but Mr. Krabs tells him a story about when he spent his first dollar to convince him that it's for his own good, and finally agreed with him.
Mystery is then let go by SpongeBob, who said his last words to her, and he begins crying while Mr. Krabs tells him that he did the right thing. Soon, Squidward notices that she ate the bank, and SpongeBob and Mr. Krabs start chasing her yelling at her to come back.
She appears to have the ability to cause nuclear explosions, as when Squidward lands on the ground after she runs through him, it causes a nuclear explosion. The same thing happens when she kicks Scooter.