Engineer Jake Holman arrives aboard the gunboat USS San Pablo, assigned to patrol a tributary of the Yangtze in the middle of exploited and revolution-torn 1926 China. His iconoclasm and cynical nature soon clash with the 'rice-bowl' system which runs the ship and the uneasy symbiosis between Chinese and foreigner on the river. Hostility towards the gunboat's presence reaches a climax when the boat must crash through a river-boom and rescue missionaries upriver at China Light Mission.

Steve McQueen
as Jake Holman

Richard Attenborough
as Frenchy Burgoyne

Richard Crenna
as Captain Collins

Candice Bergen
as Shirley Eckert

Mako
as Po-han

Larry Gates
as Jameson

Charles Robinson
as Ensign Bordelles

Simon Oakland
as Stawski

Ford Rainey
as Harris

Joe Turkel
as Bronson