The planet he uncovered was a twin to Earth...but so ominously different!
An astronaut enters a vortex and crash-lands on a parallel planet where he's not welcome.
Glenn CorbettNeil Stryker
Cameron MitchellGeorge Benedict
Sharon AckerDr. Bettina Cooke
Lew AyresProf. Dylan MacAuley
George CoulourisMax Greene
Dean JaggerCarl Webster
Steve FrankenHenry Maitland
Tim O'ConnorDr. Revere
Jerry DouglasSteve PerryArch WhitingMike Frome
H.M. WynantEric Stoner
William BryantTruck Driver
Virginia GreggWard E Administrator
Steven MarloGuard
Buck YoungTom Nelson
