Rolie Polie Olie (1998)

S1E10 Pappy Days / Copy Cat and Mouse / The Bump

A powerful storm forces the Polies to cancel their outdoor plans, but Pappy keeps Olie and Zowie entertained with tales from his own childhood. Later, Mrs. Polie asks Olie to put Zowie down for her nap. When Zowie begins copying everything Olie does, he quickly realizes he's in for a challenge. That night, a strange bump startles the family. Olie and Zowie are convinced an evil space monster is lurking, and they set off to hunt it down, while Percy Polie takes a more practical approach to solve the mystery.