King Rat is a 1965 American war film written and directed by Bryan Forbes and starring George Segal and James Fox. They play Corporal King and Flight Lieutenant Marlowe, respectively, two World War II prisoners of war in a squalid camp in Singapore. Among the supporting cast are John Mills and Tom Courtenay. The film was adapted from James Clavell's novel King Rat (1962), which in turn is partly based on Clavell's experiences as a POW at Changi Prison in Singapore in the latter part of the Second World War.