X Minus One was a half-hour science fiction radio drama series broadcast from
April 24, 1955 until it was canceled on January 9, 1958. The program aired in
various timeslots on NBC. It opened with announcer Fred Collins delivering the countdown.

Fred Collins

1948

Canadian born William (Bill) Shatner 

Shatner gained worldwide fame and became a cultural icon for
his portrayal of James T. Kirk, Captain of the USS Enterprise,
in the NBC television series Star Trek (1966–69).

Leonard Simon Nimoy (March 26, 1931 – February 27, 2015)

Leonard Nimoy, best known for playing the role of Spock in the "Star
Trek" movies and television series has died in Los Angeles. He had
been taken to the hospital earlier this week suffering from chronic
obstructive pulmonary disease, despite quitting smoking 30 years
ago.

Mark Hamill as  Luke Skywalker in the original Star Wars trilogy

Mark Richard Hamill was born in Oakland, California, and raised in 
Virginia.

Besides his best known portrayal in the Original Star Wars trilogy, Hamill
also did voice acting as The Joker in Batman, the Animated TV series,
from 1992 to 1995 on Fox.