Two scientists suspect that there is someone other than their research primates inhabiting their polar station.
| Actor | Role |
|---|---|
 Robert CulpRobert Jones | Robert Jones |
 Eli WallachFrank Enari | Frank Enari |
| MMichael C. GwynneVal Adams | Val Adams |
 Vic PerrinRyan Horner / Project Director (voice)(uncredited) | Ryan Horner / Project Director (voice)(uncredited) |