Question: Which character did a member of the cast of "Love Actually" voice in "Adventure Time"?
Sentence (from "Olivia Olson"): Olivia Rose Olson (born May 21, 1992) is an American actress and singer-songwriter, mostly known for her voice roles as Vanessa Doofenshmirtz in "Phineas and Ferb" and Marceline the Vampire Queen in "Adventure Time".
Relevant evidence: Yes