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In page He's Alive:

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Rod Serling was particularly pleased with the script for "He's Alive", and was dismayed when he learned that a scene set between Hitler's revealing himself and Vollmer's returning to Hitler was cut due to length constraints.[1] This prompted the idea of doing two versions of "He's Alive": a short version for television, and a longer version for theatrical release as a feature film.[1] His extended script added a number of scenes and even a new protagonist, an FBI agent who investigates Vollmer's neo-Nazi movement, but with The Twilight Zone's budget already stretched to the breaking point, Serling's proposal was turned down.[1] The scene following Hitler revealing himself was filmed, but the footage has since been lost.[1]