A pampered dog named Buck is stolen from his cushy home in the warm south with the aim of being sold to be a sled dog in the frigid climate of the Yukon. He escapes and finds a home with loner John Thornton (Harrison Ford), who grows to love Buck. Together they head off on an adventure into an area where no one has ever been before.

In the wild lands of the Yukon, the two share a mutual courage in facing all the dangers that nature has in store for them. From braving the rapids in a canoe, to avalanches to wild animals, the two are in for the adventure of a lifetime.

Based on the novel of the same name by Jack London.