Sam must deal with a toxic revenger when the escaped soul of a chemical company's CEO starts taking human lives. Meanwhile, the Devil delivers Sam's contract as promised... but it's a few hundred pages longer then Sam expected.

Ben's mother and grandmother stop by the Work Bench for some supplies for their family reunion. However, things go sour when the grandmother accuses Sam of being evil and calls him Diablo. Meanwhile, Sam meets a lady who has been the Devil's girlfriend for over twenty years and wonders whether her daughter is the Devil's daughter or not.

Andi finally learns Sam's secret regarding the Devil after she is captured by a demon and the gang must rescue her. Unfortunately for Sam, the truth causes Andi to fear him and keep her distance. Meanwhile, Ben meets the woman of his dreams while chasing a demon at a hospital's maternity ward, but a major fact keeps them from being together.

Morgan tells Andi that Sam is the Devil's son. An escaped soul leaves her baby behind, causing Sam, Sock, and Ben to turn to Tony for help.