G-Men vs. The Black Dragon (1943) is a Republic Pictures movie serial. It is noteworthy among adventure serials as containing an unusually high number of fistfights, all staged by director William Witney and a team of stuntmen.

This was Witney’s last production before leaving to serve in World War II. He actually shipped out before filming was complete. It also sees the return of Witney’s wife, Maxine Doyle, to acting for the first time since they met on the set of an earlier serial, S O S Coast Guard (1937).

Plot
After Japanese spies from the infamous Black Dragon Society infiltrate United States borders, Federal Agent Rex Bennett is enlisted by the government to capture them. As Oyama Haruchi, leader of the dangerous paramilitary group, begins to destabilize the United States war effort through sabotage and corruption, Bennett must team up with British special agent Vivian Marsh and Chinese special agent Chang Sing to stop them and help win the war.

Cast
Rod Cameron as US agent Rex Bennett
Roland Got as Chinese agent Chang Sing
Constance Worth as British agent Vivian Marsh
Nino Pipitone as Oyama Haruchi, Japanese spy and leader of the Black Dragon Society
Noel Cravat as Ranga, Haruchi’s assistant
George J. Lewis as Lugo, Haruchi’s assistant