AllMovie

As Tim (Bill Bixby) diverts Mrs. Brown (Pamela Britton), Martin (Ray Walston)flies his spaceship back into the garage. Unfortunately, Martin's actions are witnessed by Mrs. Brown's seven-year-old nephew Stanley (Rory Stevens), whose highly active imagination has resulted in an inordinate amount of discipline from his more "realistic" father (Don Keefer). It falls to Martin to convince Stanley's parents that the boy isn't making things up this time--without exposing himself as a Martian!