The Adventures of Smilin’ Jack (1943) is a Universal movie serial based on the comic strip The Adventures of Smilin’ Jack. It was directed by Lewis D. Collins and Ray Taylor.

Plot
In 1941, an American aviator, ‘Smilin’ Jack’ Martin wishes to resign as an advisor to the Nationalist Chinese Army in order to return to the United States to enlist as an aviator in America’s military buildup prior to the attack on Pearl Harbor. He is delayed when the Chinese discover that the neutral Tibetan like Mandon “Province” contains a secret road from India to China crucial for the Allied war effort. Determined to obtain the secret for themselves, or equally determined to have the secret destroyed is the Japanese espionage organisation “The Black Samurai” and the German intelligence agent Fräulein von Teufel who masquerades as an American newspaper reporter.

Cast
Tom Brown as ‘Smilin’ Jack’ Martin
Rose Hobart as Fräulein von Teufel
Edgar Barrier as Tommy Thompson
Marjorie Lord as Janet Thompson
Keye Luke as Capt. Wing
Sidney Toler as Gen. Kai Ling
Cyril Delevanti as Mah Ling/Han Po (his doppelganger)
Philip Ahn as Wu Tan
Nigel De Brulier as The Lo-San
Turhan Bey as Kageyama
David Hoffman as John (Johann) O. Blenker, a Nazi spy
Rico De Montezas as Hito, Japanese hitman
Jay Novello as Kushimi