The story of a boy, a dog, and a man. The boy discovers he is heir to a shipping line, and travels to Los Angeles, accompanied by inventor/radio operator Bob Whitlock and Irene Blaine. Their journey is aided by Pal, a wolf dog.

Rin-Tin-Tin Jr.
as Pal

Frankie Darro
as Frank Courtney

Boots Mallory
as Irene Courtney

George J. Lewis
as Bob Whitlock

Henry B. Walthall
as Jim Courtney

Hale Hamilton
as Norman Bryan

Fred Kohler
as Joe Stevens

Niles Welch
as Mason

Gordon De Main
as Murphy

Yakima Canutt
as Bill