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Cast (31)
Tim Holt
as Lt. Cmdr. John 'Twill' Twillinger
Audrey Dalton
as Gail MacKenzie
Hans Conried
as Dr. Jess Rogers
Barbara Darrow
as Jody Simms
Max Showalter
as Dr. Tad Johns
H.W
Harlan Warde
as Lt. Robert 'Clem' Clemens
Gordon Jones
as Sheriff Josh Peters
Mimi Gibson
as Sandy MacKenzie
Marjorie Stapp
as Connie Blake
Jody McCrea
as Seaman Fred Johnson
Wallace Earl
as Sally
D.M
Dennis McCarthy
as George Blake (lab assistant)
Sarah Selby
as Mrs. Simms
Milton Parsons
as Lewis Clark Dobbs
Charles Tannen
as Seaman Wyatt (Radioman)
R.B
Robert Benevides
as Seaman Morty Beatty
J.C
John Carlyle
as Monster Victim
J.C
John Close
as Deputy Larry
William Forrest
as Admiral Greenhouse
G.F
Gil Frye
as Deputy Scotty
Joseph Hamilton
as Other Lock Watchman
Charles Herbert
as Boy with Morty's Cap
Byron Kane
as Coroner Nate Brown
R.L
Ralph Littlefield
as Gatekeeper
David McMahon
as Patterson
Ralph Moody
as Watchman at Lock 57
William Swan
as Seaman Howard Sanders
H.T
Hal Taggart
as Davis - Resort Owner
Mack Williams
as Captain Masters
D.G
Dan Gachman
as Deputy Brewer
M.D
Michael Dugan
as Clarke
