Roy Fleming (Don Knotts) is signed on to the space program at NASA by his father Buck (Arthur O'Connell), a gung-ho former World War I vet who is trying to make something out of his son. Roy becomes a janitor who is afraid of heights and mistaken for an astronaut through a series of comedic mishaps. (Jesse White) plays Roy's boss Donelli, with (Leslie Nielsen) as space hero Major Gifford. Knotts uses his patented brand of nervousness to perfection in this lighthearted situation comedy.