The Diffy's discover Curtis the Caveman stowed away in the time machine and now it's up to Lloyd to decide if they should keep him. Pim goes to Debbie's sleepover and tries to find a way out.

Phil skips Unification Day to go to a party that he can't even get in to. Pim cheats on a cooking assignent, so she has to bake something homemade.

Phil tries to find out if Keely's crush is cheating on her by using his "insta morph" to make himself look like Tanner.

Lloyd and Barbara decide to go on a weekend road trip for their anniversery. They leave Phil in charge of Pim and if everything goes right then Phil will get an afterburner for his skyak. Once Pim hears this she is not happy and tries everything in her power to make the weekend go bad so Phil won't get the afterburner.

Phil's poor penmanship lands him back in Miss Winston's second grade class. Tanner shows him up in front of the whole school, but Phil learns to laugh at himself.

Phil gets detention and goes to the dance with his new "guy friends." But when a bull attacks his new friend, he morphs it into a cat. Pim is tardy too many times, so she dresses Curtis up as her father to get off being punished.

Phil helps Keely with her stage fright so Phil shrinks himself and sits on her microphone during her performance; Pim and Bradley become co-parents of a bag of flour as part of a class assignment on raising a baby.

Phil and Pim worry that Lloyd will embarrass them when he plans to play American folk music at their school concert; Barbara takes Curtis to a dentist when he gets a toothache.

Phil tries to dissuade another girl's affections; Pim joins the orchestra to sabotage Debbie's solo; Pim meets Bradley Benjamin Farmer.

Phil uses a futuristic gadget to compete in the gymnastics tournament.

Phil and Keely go to the Tomato Ranch. But Phil is worried about going in the tomato mashing tub as he only has 4 toes.

Phil and Keely start a day-care service for dogs to earn money for concert tickets. Phil uses a futuristic gadget to understand what a dog is saying.

A school video project causes Phil to overlook his friends' feelings; Pim is recruited for a track meet.

Debbie enlists everyone is school to help her bake cupcakes except Pim. But soon enough Pim is forced into giving the drum beat to the bakers. Phil and Keely try to help the helpless bakers.

Keely uses the "New-Ager" and pretends to be a substitute teacher, but she then gains the attraction of Mr. Hackett.

Phil tries to impress the mayor's daughter but things get bad when he switches places with Curtis. Pim realizes that she can't stand Debbie and doesn't even want to be her friend.

Phil defends Pim against a bully and then he gets bullied. Curtis takes the neighbor's lawn ornaments and calls them his "friends."

Phil and Keely enter a science fair featuring next Century's "milk engine" sending Lloyd into a state of panic that the Diffys will be discovered. Phil and Keely sneak into the fair to retrieve the evidence so the Diffys can remain in Pickford.

Phil and Keely pretend to be in cheerleading to impress Mrs. Teslow. Pim tries to find the one thing that Debbie can't stand.

Phil's future "friend" comes to 2121. He offers the Diffy's a way to get home. Will Phil choose the right decision?