Calificación
Reparto

Robert Foxworth
Questor

Mike Farrell
Jerry Robinson

John Vernon
Geoffrey Darro

Lew Ayres
Vaslovik

James Shigeta
Dr. Chen

Robert Douglas
Dr. Michaels

Dana Wynter
Lady Helena Trimble

Ellen Weston
Allison Sample

Majel Barrett
Dr. Bradley

Reuben Singer
Dr. Gorlov

Walter Koenig
Administrative Assistant

Fred Sadoff
Dr. Audret

Gerald Peters
Randolph

Eyde Girard
Stewardess

Alan Caillou
Immigration Offical

Lal Baum
Col. Hendricks