Cheryl insists on continuing her winning ways at family game night, but Dana, convinced that her sister has been cheating, seeks a way to expose the deceit.
Jim confronts Cheryl after learning from her gynecologist that she has been advised to be more active instead of being placed on bedrest as she claimed.
The arrival of the twins brings the Devil to town to claim Jim's fifth-born child, which he had promised in exchange for help courting Cheryl years earlier.
When Cory and Eric find out that Alan has lied about the father/son softball game being cancelled because he knows they don't want to attend, they make amends.
Perpetually bumbling Bridget becomes suspicious of boyfriend Mark's relationship with his new co-worker and she goes to Thailand with playboy Daniel Cleaver.
A young mermaid dreams of life on land after falling in love with a human prince and makes a deal with a sea witch for the chance to make him fall for her.
Jim takes over childcare from an exhausted Cheryl, and when one of the twins' blankets goes missing, he guilts the older kids into doing all of the chores.
Jim and his band get the opportunity to play for a child pop sensation, but when she releases her ego, Jim tries to set her straight and teach her a lesson.