Special Guest Stars Ralph Meeker as John Dexter Guest Stars Henry Silva as Gen. Juan Mercurio Henry Darrow as Policeman Noel de Souza as Capt. Fortunado Jay Novello as Prof. Arivello Willard Sage as First Reporter Stuart Lancaster as Skipper Janet Blair as Lynn Arthur Edward Colmans as Servant Martin Garralaga as Paco Jon Silo as Oswaldo Jerry Douglas as Tom Evans Uncredited Shelley Morrison as Woman Paul Stader as Ichthyosaur Bill Hart as Ichthyosaur George Robotham as Ichthyosaur Steve Carruthers as Party Guest