Washington [US], July 28 (ANI): Glen Powell is set to add some humour to this Halloween with his guest appearance on ‘Family Guy’s upcoming special episode. Revealed during the show’s San Diego Comic-Con panel on Saturday, Powell will voice Patrick McCloskey, a fiercely competitive pumpkin carver, according to Deadline. In this Halloween-themed episode, Peter Griffin and his friends will challenge McCloskey, the reigning champion of Quahog’s annual Pumpkin Contest. “Peter and his friends aim to unseat the reigning champion (Powell) in Quahog’s annual Pumpkin Contest by any means necessary,” th…