To return from a time trip to 1864 Colorado, the Szalinskis must help an alien recover his starship from a ruthless gang, who master the alien's weapons and defenses.

Wayne's chemical to increase intelligence has different effects on the family, including mind reading and levitation, while their dog, Quark, is able to hypnotize people.

Diane wants to get in touch with her teenage-self so that she can understand what Amy and her new client, Howard, are going through. Wayne has invented a machine where you can see yourself in the past. When the electricity goes out, Diane is stuck as a teenager. Now Wayne must fix the machine and the family has to deal with Diane and her rebellious self.