Elenco - The Monster That Challenged the World
Tim Holt
Lt. Cmdr. John 'Twill' Twillinger
Audrey Dalton
Gail MacKenzie
Hans Conried
Dr. Jess Rogers
Barbara Darrow
Jody Simms
Max Showalter
Dr. Tad Johns
Harlan Warde
Lt. Robert 'Clem' Clemens
Gordon Jones
Sheriff Josh Peters
Mimi Gibson
Sandy MacKenzie
Marjorie Stapp
Connie Blake
Jody McCrea
Seaman Fred Johnson
Wallace Earl
SallyDennis McCarthy
George Blake (lab assistant)
Sarah Selby
Mrs. Simms
Milton Parsons
Lewis Clark Dobbs
Charles Tannen
Seaman Wyatt (Radioman)Robert Benevides
Seaman Morty BeattyJohn Carlyle
Monster VictimJohn Close
Deputy Larry
William Forrest
Admiral GreenhouseGil Frye
Deputy Scotty
Joseph Hamilton
Other Lock Watchman
Charles Herbert
Boy with Morty's Cap
Byron Kane
Coroner Nate BrownRalph Littlefield
Gatekeeper
David McMahon
Patterson
Ralph Moody
Watchman at Lock 57
William Swan
Seaman Howard Sanders
Hal Taggart
Davis - Resort Owner
Mack Williams
Captain MastersDan Gachman
Deputy BrewerMichael Dugan
Clarke