The Underseas Gold Fort! * KILLER SHARK Appearance Killer Shark uses a large, shark-shaped submarine to steal an inventor's giant magnet that can pull gold from sea water. The Blackhawks fail to stop him, so to track him, they melt down all their trophies and use the gold to plate the bow of the Hawk-sub. The gold magnet draws the gold plated sub to it, and the Black Knights use the gold Killer Shark has accumulated to smash the glass walls of his undersea control room and rescue the inventor.