The Twilight Zone Episode: "Nightmare at 20,000 Feet"
Season 5, Episode 3
Episode Synopsis: William Shatner plays an Arminian salesman, Bob Wilson, recovering from a breakdown---until he sees a Romans 9 Grenade on the wing of his plane. Thinking the "creature" is damaging the plane, when in reality he was repairing the faulty wiring, Bob Wilson starts to lose his sanity in mid-flight.
Written by Richard Matheson and Directed by Richard Donner (“Superman”). Host: Rod Serling.