Returning from a hunting trip in the forest, the Henderson family's car hits an animal in the road. At first they fear it was a man, but when they examine the "body" they find it's a "bigfoot". They think it's dead so they decide to take it home (there could be some money in this). As you guessed, it isn't dead. Far from being the ferocious monster they fear "Harry" to be, he's a friendly giant.
John Lithgow
as George Henderson
Melinda Dillon
as Nancy Henderson
Margaret Langrick
as Sarah Henderson
Joshua Rudoy
as Ernie Henderson
Kevin Peter Hall
as Harry
David Suchet
as Jacques Lafleur
Lainie Kazan
as Irene Moffitt
Don Ameche
as Dr. Wallace Wrightwood
M. Emmet Walsh
as George Henderson Sr.
Laura Kenny
as 'Mouse' Woman
William Ontiveros
as Sgt. Mancini
David Richardt
as Dirty Harry Officer