A dog named Thunder, the weakling of his brood, is born in a lumber camp in the North Woods, operated by Anita Baker. The cowardly dog is cast out of the camp and adopted by forest ranger Allen Gregory. Meanwhile, Bill Martin, the brutal camp superintendent, covets both Anita and her property. When Bill attacks Anita, Thunder comes to the rescue and proves his courage by warding off the villain.

Thunder the Dog
as Thunder

Virginia Brown Faire
as Anita Baker

Reed Howes
as Allen Gregory

William Russell
as Bill Martin

Hank Mann
as Red Jones

Jack Padjan
as Henchman (uncredited)