提姆·霍尔特

Tim Holt

饰：Lt. Cmdr. John 'Twill' Twillinger

奥黛丽·达尔顿

Audrey Dalton

饰：Gail MacKenzie

汉斯·康拉德

Hans Conried

饰：Dr. Jess Rogers

Harlan Warde

饰：Lt. Robert 'Clem' Clemens

Max Showalter

饰：Dr. Tad Johns (as Casey Adams)

美美·吉布森

Mimi Gibson

饰：Sandy MacKenzie

戈登·琼斯

Gordon Jones

饰：Sheriff Josh Peters

Marjorie Stapp

饰：Connie Blake

Dennis McCarthy

饰：George Blake (lab assistant)

芭芭拉·达罗

Barbara Darrow

饰：Jody Simms

Robert Beneveds

Robert Beneveds

饰：Seaman Morty Beatty (as Bob Beneveds)

Mack Williams

饰：Capt. Masters

Eileen Harley

Eileen Harley

饰：Sally

乔迪·麦克瑞尔

Jody McCrea

饰：Seaman Fred Johnson

威廉·斯万

William Swan

饰：Seaman Howard Sanders

查尔斯·坦嫩

Charles Tannen

饰：Seaman Wyatt (radioman)

Byron Kane

饰：Coroner Nate Brown

Hal Taggart

饰：Davis, the resort owner

Gil Frye

饰：Deputy Scotty

Dan Gachman

Dan Gachman

饰：Deputy Brewer

Milton Parsons

饰：Lewis Clark Dobbs

Ralph Moody

饰：Watchman at Lock 57

约翰·卡莱尔

John Carlyle

饰：Monster Victim (uncredited)

John Close

饰：Deputy Larry (uncredited)

William Forrest

饰：The Admiral (uncredited)

约瑟夫汉密尔顿

Joseph Hamilton

饰：The Other Lock Watchman (uncredited)

查尔斯·赫伯特

Charles Herbert

饰：Boy with Morty's Cap (uncredited)

Ralph Littlefield

饰：Gatekeeper (uncredited)

David McMahon

饰：Patterson (uncredited)

萨拉·塞尔比

Sarah Selby

饰：Mrs. Simms, Jody's mother (uncredited)

Wallace Earl Laven

饰：Sally

Robert Benevides