William OslerMu Lambda 165 (aka: Host Computer) James BarronGarth's Father Aileen SeatonRachel's Mother 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) John Meredyth LucasFörfattare Shimon WincelbergFörfattare Arthur HeinemannFörfattare Ed RichardsonAssociate Producer William DavidsonProducent Douglas TrumbullExekutiv producent Jerome M. ZeitmanExekutiv producent Gerry RochonExekutiv producent Gordon WhiteArt Direction Larry S. WellsWardrobe Master Carol DavidsonMakeup Designer Shirley MannCostume Design Ray FitzwalterAssistant Director Wally WeaverSound Re-Recording Mixer Wallie HarrisSound Re-Recording Mixer Gary SmithUnit Production Manager Derrett LeeProduction Coordinator Barrie DiehlUnit Production Manager Jack McAdamProduction Designer Mary Lou FraserProduction Assistant Berniece GilliesProduction Assistant Arthur WeinthalExecutive In Charge Of Production Mereline ThompsonModeling Norman KlenmanStory Consultant Ursula K. Le GuinOriginal Story 
