In "The Losing Edge", when the game is ending, Allen is last up to bat for his team. With Stan Marsh pitching, Allen first swings a strike, with Randy Marsh distracting him with "Hey, Batter Batter". He swings at another strike, as Randy and a Conifer dad begin to fight over Randy's trash talking. Stan finally strikes Allen out, thus ending the game.
Allen wears a baseball uniform that is black, green, and white. He wears black shoes and a green baseball helmet. His jersey is mostly green, with black sleeves and white trim. It has the word "Conifer" on the front.