The Monster That Challenged the World - 5.66★

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

Jody McCrea - Seaman Fred Johnson

Wallace Earl - Sally

Sarah Selby - Mrs. Simms

Milton Parsons - Lewis Clark Dobbs

Charles Tannen - Seaman Wyatt (Radioman)

William Forrest - Admiral Greenhouse

Joseph Hamilton - Other Lock Watchman