Stan discovers that Francine was unfaithful one night before she and Stan married. With the possibility that Hayley may not be his biological daughter, he travels back in time to find out who the mystery dad might be. But when he inadvertently disrupts the events of the past, he must do everything to avoid changing the future.

When Stan catches Steve playing imaginary games with his toys, he decides to take his son down to Mexico to help him become a man. But the trip takes a turn for the worse when Stan and Steve are kidnapped by a drug cartel, and it's up to Steve to break himself and Stan out of captivity.