When a plane crashes on a mountaintop Chris wants to plunder the wreckage. His older brother Zachary has given up mountain guide work but goes along rather than letting his brother risk it alone. The only survivor is a Hindu girl who Chris wants to kill. Zachary fights him off. While Chris steals from the dead passengers, Zachary prepares a sled to take the girl down the mountain.

Set in the rural south of the United States, a bereaved war widow learns to to put aside her bitterness and grief as she grows to love a young orphan boy and the dog that belonged to her late son. Punctuated with song-filled interludes.

Thunder Afloat is set during the first world war. Wallace Beery plays an veteran tugboat captain who harbors a grudge against younger ex-pal Chester Morris. When Morris joins the navy as an officer, he runs across Beery, who resparks the feud. Both men bury the hatchet and work shoulder to shoulder when German U-boats threaten innocent shippers. Though the action takes place in 1918, the film was intensely topical in 1939 given the renewal of maritime hostilities in Europe and the Far East. Thunder Afloat made money by the bushel basket, as did most of Wallace Beery's formula vehicles.