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Tim HoltLt. Cmdr. John 'Twill' Twillinger
Audrey DaltonGail MacKenzie
Hans ConriedDr. Jess Rogers
Barbara DarrowJody Simms
Max ShowalterDr. Tad Johns
Harlan WardeLt. Robert 'Clem' Clemens
Gordon JonesSheriff Josh Peters
Mimi GibsonSandy MacKenzie
Marjorie StappConnie Blake
Jody McCreaSeaman Fred Johnson
Wallace EarlSallyDennis McCarthyGeorge Blake (lab assistant)
Sarah SelbyMrs. Simms
Milton ParsonsLewis Clark Dobbs
Charles TannenSeaman Wyatt (Radioman)Robert BenevidesSeaman Morty BeattyJohn CarlyleMonster VictimJohn CloseDeputy Larry
William ForrestAdmiral GreenhouseGil FryeDeputy Scotty
Joseph HamiltonOther Lock Watchman
Charles HerbertBoy with Morty's Cap
Byron KaneCoroner Nate BrownRalph LittlefieldGatekeeper
David McMahonPatterson
Ralph MoodyWatchman at Lock 57
William SwanSeaman Howard Sanders
Hal TaggartDavis - Resort Owner
Mack WilliamsCaptain MastersDan GachmanDeputy BrewerMichael DuganClarke
