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Marceline the Vampire Queen is a main character in the American animated television series Adventure Time created by Pendleton Ward. She is voiced by Olivia Olson in most appearances (pictured), by Ava Acres as a child and by Cloris Leachman as an old woman. Marceline is a fun-loving 1,000-year-old trickster vampire queen. The character makes her debut in the first season episode "Evicted!" and functions as an antagonist, forcing Finn (voiced by Jeremy Shada) and Jake (voiced by John DiMaggio) from their home. Marceline has been critically acclaimed and is popular with fans of Adventure Time. Ward himself has stated that Marceline is his favorite character in the series because he does not know everything about her history and backstory, which he noted adds a mysterious element to her character. Despite the positivity, the episode "What Was Missing" became somewhat controversial because of an allegedly implied past relationship between Princess Bubblegum (voiced by Hynden Walch) and Marceline.