He tries to get Steve to join in the activities but is spurned by both Steve and Klaus who feel that they are becoming too old for such things as he expects to become an uncle with Jeff and Hayley's efforts to conceive. Despite this, Mark still promises to be there for them. When they end up on the wrong side of a drug gang, Steve and Klaus are rescued from death by Mark and the club as promised. Mark is voiced by Michael Showalter.