Billy & Mandy's Big Boogey Adventure is a 2007 made-for-television animated adventure fantasy comedy film produced by Cartoon Network Studios, and is the first made-for-television film based on the animated series The Grim Adventures of Billy & Mandy, the second being Billy & Mandy: Wrath of the Spider Queen. Big Boogey Adventure premiered in the United States on March 30, 2007, and in the UK on February 14, 2007, and was released on DVD in the U.S. on April 3, 2007.

Adam Maxwell Burton, known professionally as Maxwell Atoms, is an American animator, screenwriter, storyboard artist, and voice actor. He is the creator of the Cartoon Network series Grim & Evil and its subsequent spin-offs, The Grim Adventures of Billy & Mandy and Evil Con Carne.