Max and 99 go on a commando raid to destroy a KAOS navigation computer on a small island. When returning to their sub after blowing up the computer, Max and 99 mistakenly end up in a KAOS sub commanded by Siegfried. The sub has been tracked by the U.S. Navy, however, and they want to destroy the sub. The Chief is then forced to decide between torpedoing the sub and killing his friends, or letting the sub escape.