Happy Days - Season 6 is a Comedy, Family, Music TV Series whose creator is Garry Marshall. It was released on 12 Sep. 1978. It stars Ron Howard, Henry Winkler, Marion Ross. The season begins with: The Cunninghams and their friends go west to help run Marion’s injured Uncle Ben’s Colorado dude ranch, soon finding that they only have five days to pay the balance on a loan owed to nasty neighbor.. What await ahead?