Marion Ross and Tom Bosley in Let's Call It Quits (1974)

Marion Ross, Tom Bosley, Kim Durso, Robbie Rist, and Brad Savage in Let's Call It Quits (1974)

Marion Ross and Joan Benedict Steiger in Let's Call It Quits (1974)

Marion Ross, Joan Benedict Steiger, Tom Bosley, Norman Burton, Tracy Reed, and James A. Watson Jr. in Let's Call It Quits (1974)

Marion Ross in Let's Call It Quits (1974)

Ron Howard, Henry Winkler, Marion Ross, Tom Bosley, Erin Moran, Don Most, and Anson Williams in Happy Days (1974)

Ron Howard, Marion Ross, Tom Bosley, Erin Moran, and Randolph Roberts in Happy Days (1974)

Henry Winkler and Marion Ross in Happy Days (1974)

Henry Winkler, Marion Ross, and Tom Bosley in Happy Days (1974)

Marion Ross and Gale Storm in Love Boat (1977)

Marion Ross in Please Tell Me I'm Adopted! (2017)

Marion Ross, Andie Karvelis, Nicole Dupre Sobchack, and Ben Kacsandi in Please Tell Me I'm Adopted! (2017)

Marion Ross, Andie Karvelis, Aimee Adams Hall, Nicole Dupre Sobchack, Ben Kacsandi, and Sage Ortega in Please Tell Me I'm Adopted! (2017)

Jennifer Jason Leigh, Marion Ross, and Kari Michaelsen in Junge Schicksale (1972)

Charlie Sheen and Marion Ross in Anger Management (2012)

Marion Ross and Barry Kelley in The Lone Ranger (1949)

Edward Herrmann, Marion Ross, Alexis Bledel, and Lauren Graham in Gilmore Girls (2000)

Chris Eigeman, Edward Herrmann, Marion Ross, Kelly Bishop, and Lauren Graham in Gilmore Girls (2000)

Marion Ross at an event for A Beautiful Mind: Genie und Wahnsinn (2001)

Ron Howard and Marion Ross at an event for EDtv (1999)

Ron Howard, Henry Winkler, Marion Ross, Tom Bosley, Joyce Brothers, Erin Moran, and Anson Williams at an event for Happy Days (1974)

Marion Ross and Magda Apanowicz in A Reason (2014)

Marion Ross at an event for Das Comeback (2005)

Marion Ross and Topher Grace in Die wilden Siebziger (1998)

Melissa Sue Anderson and Marion Ross in Which Mother Is Mine? (1979)

Henry Winkler, Marion Ross, Tom Bosley, Erin Moran, Don Most, and Anson Williams in Happy Days (1974)