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
Don Ameche
as Dr. Wallace Wrightwood
David Suchet
as Jacques Lafleur
Margaret Langrick
as Sarah Henderson
Joshua Rudoy
as Ernie Henderson
M. Emmet Walsh
as George Henderson Sr.
John Bloom
as Feet
Lainie Kazan
as Irene Moffitt
Kevin Peter Hall
as Harry
William Ontiveros
as Sgt. Mancini
David Richardt
as Dirty Harry Officer