The S. S. Arcturus sails from Shanghai to San Francisco, and Dr. Jim Craig takes the post of ship's physician in order to be near Ann Grayson, the ship's nurse. Chief Engineer 'Crusher" McKay also has his eyes on Ann, and this brings an immediate conflict between the two men. When an epidemic breaks out below decks, Craig tells McKay the engine-and-fire rooms must be put under quarantine, but all of Craig's efforts to keep the disease from spreading are opposed by McKay.
Victor McLaglen
Crusher McKay
Chester Morris
Doctor Craig
Wendy Barrie
Ann Grayson
Alan Hale
Gallagher
Barry Fitzgerald
Britches
Allan Lane
Bilson
Halliwell Hobbes
Captain Mathews
Cy Kendall
Deadeyes
Paul Guilfoyle
Wishart
John Wray
Metcalfe