Marcus is a secondary protagonist of the 2003 crime-comedy film Bad Santa, in which he later becomes the main antagonist (still a villain). He is a dwarf who, being a friend of Willie Stokes, dresses as an elf in order for them to rob the mall.
What proves him to become the main antagonist but stay evil is that he finds Willie unreliable when the latter warms up to a boy named Thurman Merman. He also teams up with his wife, another criminal, named Lois.
Eventually, he attempts to murder Willie, but he and Lois get caught by the police and are taken to prison.
As revealed by the sequel's movie trailers, Marcus has been released from jail and becomes Willie's friend again (admitting that they parted on "bad terms") so they can continue pulling off holiday heists.
Marcus is played by Tony Cox.