Waterskiing is fun, but investigating old prisons are not. The gang gets to do both in this episode. Skull Island, a nearby prison, is haunted by Ironface. He must've been a nasty customer, because the warden ordered an iron mask to be welded onto his face. Nasty. This dude likes to ski around with his missile/fish/whatever things and chase meddling kids.
7/10 +1, because this guy is really scary.