A storm ruins the Polies' plans, but Pappy manages to entertain Olie and Zowie with stories about his childhood.; Mrs. Polie tells Olie to put Zowie down for her nap; however, when Zowie starts to copy Olie's every movie, he realizes that he's in for some trouble.; The Polies hear a strange bump in the night. Olie and Zowie, believing it to be an evil space monster, try to hunt down the source of the sound, while Percy Polie tries to solve the problem in a more practical way.