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 -- a janitor who is afraid of heights -- becomes a victim of mistaken identity and, through a series of comedic mishaps, The Reluctant Astronaut
. (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.