Captain James Tiberius 'Jim' Kirk
Mister Spock
Nancy Crater
Prof. Robert Crater
Dr. McCoy
Yeoman Janice Rand
Sulu
Uhura
Green
Darnell
Crewman
Nancy III
Barnhart (uncredited)
Crewman (uncredited)
Crewman Sturgeon (uncredited)
Beauregard (uncredited)
Lieutenant Hadley (uncredited)
Brent (uncredited)
Lieutenant Commander Montgomery 'Scotty' Scott (voice) (uncredited)
M-113 Creature (uncredited)
Yeoman (uncredited)
Lieutenant Ryan (uncredited)
Berkeley (uncredited)
Security Guard (uncredited)