'Happy Days' Mom Marion Ross to Guest Star on NBC's UP ALL NIGHT

As first reported on TVLine.com, 'Happy Days' mom Marion Ross will be returning to the small screen in a guest starring role on NBC's comedy series UP ALL NIGHT. Ross will join her fellow 'Happy Days' castmate Henry Winkler on the show. Winkler will portray Ava's father, while Ross is set to play the stern buT Loving grandmother of Will Arnett's 'Chris'. 

In the episode, Ross will go head to head with Reagan (Christina Applegate) who can't stand her husband's doting grandmother. The two also clash over ownership of a cherished family heirloom. 

Ross is best known for her role as Marion Cunningham on the ABC comedy series 'Happy Days' which aired from 1974 - 1984. Her film work includes The Glenn Miller Story (1954), Sabrina (1954), Teacher's Pet (1957), and Operation Petticoat (1959).

UP ALL NIGHT will conclude its first season in mid-April.