We're not really sure how Jack got in here. The rumor is a disgruntled former cast member let him in through the side door, and Jack never left afterward. The kid sells tickets though, so we've put him on a Harold team and have really just been hoping for the best since then. He has performed at Harold Night with the Buskers, Intervention!, and Eddy.
You can currently see him perform with Nixon, or anytime if you turn the lights off and shout his name three times into a mirror.