Question: The Lucy Show is an American sitcom that aired on CBS from 1962–68, for the first three seasons, Vivian Vance was the co-star, Vance was an American television and theater actress and singer, best known for her role as who?
Sentence (from "Vivian Vance"): Vance is best known for her role as Ethel Mertz, sidekick to Lucille Ball on the American television sitcom "I Love Lucy", and as Vivian Bagley on "The Lucy Show".
Relevant evidence: Yes