The Actress Who Plays Marceline The Vampire Queen In Adventure Time Is Gorgeous In Real Life – Looper

Since her introduction in Season 1, Marceline the Vampire Queen has been voiced by Olivia Olson. Sharp-eared animation fans may recognize Olson's voice from "Phineas and Ferb" in which Olson played Vanessa Doofenshmirtz from 2008 to 2015. Olson has become a fixture on adult-friendly animated series, having also appeared in episodes of "Steven Universe" and "Robot Chicken."

Olson's best-known live-action role takes us back to the halcyon days of 2003 when the young actress played Joanna in "Love Actually." Olson's honeyed voice delivered a version of Mariah Carey's "All I Want For Christmas" that rivals the original. The then-10-year-old's performance was so good, that the producers asked her to sing a version with fewer runs and vocal flourishes. "My dad told me later that they were like, 'She sounds too good. No one's going to believe that she's really singing that,'" Olson told EW. Seven years later, Olson brought her singing talents to "Adventure Time," where Marceline's songs soundtracked some of the series' most poignant plot lines.

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The Actress Who Plays Marceline The Vampire Queen In Adventure Time Is Gorgeous In Real Life - Looper