Al gets a once-in-a-lifetime (well, not exactly) chance to become a co-owner of Harry's Hardware Store. But, once he does become the co-owner, he becomes too busy to pay attention to Ilene.
Meanwhile, Randy and Brad want to win the Halloween contest on who has the best costume. They dress up as zombies, while Mark dresses up as Al! Flannel, jeans, and the Harry's Hardware Store t-shirt, and he's ready to go! The surprise is, he wins the contest!
Note: In season 2, he dressed up as Tim.