29 years old William Shatner in episode Nick of Time (1960).
Official synopsis: "A pair of newlyweds stopping in a small town are trapped by their own superstition when playing a fortune telling machine in a local diner."
This is not his famous Twilight Zone episode about the furry creature destroying the wing of the airplane, Nightmare at 20,000 Feet was filmed in 1963.
Bill looks much better in this one, wearing less make-up and for the most part he isn't overacting that much ;-)