Rear Admiral Stephen Thomas' (Charles Laughton) spoken tribute to "the finest Naval officer I knew" provides the framework for the wartime flag-waver Stand By For Action. Robert Taylor stars as Gregg Masterman, a flippant socialite who comes to realize his obligation to his country when he is called to active duty during WW II. Determined to get sea duty, Lt. Masterman is passed over by Admiral Thomas in favor of Lt. Cmdr. M. J. Roberts (Brian Donlevy), who, unlike our academy-trained hero, rose from the ranks to his present position of authority. Any differences between Masterman and Roberts are forgotten in the climactic attack against a formidable Japanese "super-battleship." Though there's precious little room for romance in this essentially all-male entertainment, Stand by for Action offers Robert Taylor a brief dalliance with up-and-coming MGM starlet Marilyn Maxwell.