Richard Bakalyan returns as Charlie, Squad 51's trouble-prone mechanic. The paramedics decide to purchase a boat from Charlie, intendig to sail it on their days off and rent it to others when they're on duty. Of course, things don't quite go as plann... (more)ed, thanks to a wide variety of emergency calls, including the rescue of two boaters from a particularly treacherous stretch of water off Catalina Island, a bookie suffering from a coronary in a locked office, and an explosion in the hospital lab.