Adam thinks he's seen a UFO outside his window and his sisters are convinced they've seen an alien in the kitchen. Walter will have none of it and directs Charles to rid the children of such superstitious nonsense (which he says comes from "fuzzy thinking"), but when Charles sees a UFO too, he doesn't know what to believe. Then Walter sees one and becomes an instant convert, calling the local news crew to come out for an interview. In the meantime, Charles is so distraught that he even asks Buddy for advice. He accidentally finds out that the topic of Buddy's psychology term paper required the simulation of a UFO experience in a typical American household. Though Charles is angry, he is grateful that one mystery is solved. Later the kids find a guinea pig in the dryer - their "alien" - and another mystery is solved. There is one left...