Mr. Holliman had an entire host segment of Mystery Science Theater 3000 (found in episode 418 - Attack of the Eye Creatures) dedicated to him and his career wherein Joel Hodgson stated, "Earl Holliman: who would have been William Shatner, had there not already been one.".
Played the main character in the very first "Twilight Zone" episode to be telecast, "Where is Everybody?" (October 2, 1959).