The Henderson's, returning from a hunting/camping vacation literally run into a Sasquatch with their family station wagon. Believing the body to be a great scientific discovery they take it home with them. Great plan, but it isn't dead. At first terrified by it they soon learn that Harry, as they call him, is a kind and sensitive soul as well as somewhat quirky.
As they grow fonder of him they soon release that keeping him is placing him in danger from fanatic yeti hunters, played brilliantly by David Sachet, and employ the help and wisdom of the great Don Ameche, who is kinda a curator of the Sasquatch legend.