Marmaduke "Moose" Mason (often referred to as Big Moose) is a fictional character in the Archie Comics universe. He attends Riverdale High School where he is typically depicted as the best athlete but the poorest student. His difficulties with school were later attributed to dyslexia. Mason is a Russian-American. The live-action version of Moose is portrayed by Cody Kearsley in Riverdale.