Irwin Allen Director, Producer, Screenwriter Walter Pidgeon Adm. Harriman Nelson Actor Joan Fontaine Dr. Susan Hiller Actor Barbara Eden Lt Cathy Connors Actor Peter Lorre Comm. Lucius Emery Actor Robert Sterling Capt. Lee Crane Actor Michael Ansara Miguel Alvarez Actor Frankie Avalon Lt (j.g.) Danny Romano Actor Regis Toomey Dr. Jamieson Actor John Litel Vice-Adm. B.J. Crawford Actor Howard McNear Congressman Llewellyn Parker Actor Henry Daniell Dr. Zucco Actor Mark Slade Seaman Jimmy "Red" Smith Actor Charles Tannen CPO Gleason Actor Del Monroe Seaman Kowski Actor Anthony Monaco Cookie Actor Robert Easton Sparks Actor Jonathan Gilmore Seaman George Young Actor David McLean Ned Thompson Actor Larry Gray Dr. Newmar Actor George Diestel Lt. Hodges Actor Skip Ward Crew member Actor Michael Ford Crew member Actor Art Baker UN Commentator Actor Kendrick Huxham UN Chairman Actor John Giovanni Italian Delegate Actor Charles Bennett Screenwriter