Who was originally hired as the voice of "The Twilight Zone"?

Cayuga Productions, Inc.CBS Productions, Public domain, via Wikimedia Commons
"The Twilight Zone" opens with Rod Serling inviting viewers into "a fifth dimension beyond that which is known to man," which is pretty bold when most people can't explain the fourth one. Serling's original script referenced a sixth dimension, but that was a place beyond that which was known to Serling. Serling's correction and his own voice are dubbed over the first episode because he wasn't the original narrator. Who was originally hired as the voice of "The Twilight Zone"?



