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The Grim Adventures of Billy and Mandy: Season 1, Episode 14 - A Grim Surprise (2002)
Released: August 2, 2002
Billy tells Grim to help him throw a surprise birthday party for Mandy. Then, a reluctant Grim helps Billy prepare a cake while keeping it a secret from Mandy. In the end, a somewhat surprised Mandy reveals that her birthday isn't for the next five months, something that Billy already knew about.
