James T. Kirk
Spock
Dr. McCoy
Scott
Sulu
Uhura
Pavel Chekov
Clifford Brent / Soldier at Party
Lieutenant Leslie (uncredited) / Conners
Harrison / Eminiar Guard
Lieutenant Kyle
Christine Chapel / Number One
Galloway / Johnson
Janice Rand
Trelane's Mother (voice) (uncredited) / Lights of Zetar (voice)
Warning call from the S.S. Deidre (voice) / Space Central (voice)(uncredited)
Guard (uncredited) / Chekhov's Helper (uncredited)
Lieutenant Hadley (uncredited) / Lieutenant Hadley (voice)
Crewman (uncredited) / Civilian Engineer (uncredited)
Enterprise Crew Member (uncredited) / Enterprise Science Crew Member (uncredited)
Nomad (voice) / Metron (voice)
Trelane's Father (voice) (uncredited) / Yarnek (voice)
Lt. Palmer / The companion (voice)
DeSalle
