Mr. Krabs doesn't like Mystery, and wants SpongeBob to let her 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 agrees with him.
Mystery is then let go by SpongeBob, albeit reluctantly. Soon, Squidward notices that she ate the bank, and SpongeBob and Mr. Krabs start chasing after 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.