Marion Ross (born October 25, 1928, in Albert Lea, Minnesota) is an American actress, best known for her role as Marion Cunningham on Happy Days. She played Mrs. Trowburg in Scooby-Doo! Curse of the Lake Monster.
At the age of 13, Ross changed the spelling of her name from "Marian" to "Marion" because she thought it would look better on a marquee.
- Marion Ross at the Internet Movie Database