William OslerMu Lambda 165 (aka: Host Computer) Aileen SeatonRachel's Mother James BarronGarth's Father Sterling HaydenOld Jeremiah Gillie FenwickOld Abraham Sean SullivanRachel's Father Kay HawtreyGarth's Mother Frank ConverseDr. Gerald W. Aaron Lloyd BochnerCol. M.P. Garoway David TyrellOne - Captain Percy RodriguezSakharov Richards Edward AndrewsLinus Farthing William HuttDr. Pete Marshall Antoinette BowerDr. Heather Marshall Ivor BarryChief Rathe Masters Clive Endersby1st Tube Dweller Alan Bleviss2nd Tube Dweller Iréna MayeskaDr. Diana Tabor Allen Stewart-CoatesMagnus (voice) Joseph L. ScanlanDirector John Meredyth LucasScénariste Arthur HeinemannScénariste Shimon WincelbergScénariste Douglas TrumbullExecutive Producer Ed RichardsonAssociate Producer William DavidsonProducteur Jerome M. ZeitmanExecutive Producer Gerry RochonExecutive Producer Gordon WhiteArt Direction Larry S. WellsWardrobe Master Carol DavidsonMakeup & Hair Shirley MannCostume Designer Ray FitzwalterAssistant Director Wally WeaverSound Re-Recording Mixer Wallie HarrisSound Re-Recording Mixer Jack McAdamProduction Designer Gary SmithUnit Production Manager Barrie DiehlUnit Production Manager Derrett LeeProduction Coordinator Berniece GilliesProduction Assistant Arthur WeinthalExecutive In Charge Of Production Mary Lou FraserProduction Assistant Mereline ThompsonModeling Norman KlenmanStory Consultant Ursula K. Le GuinOriginal Story 
