WHAT HAS GONE BEFORE: The submarine Catlantis had successfully rescued a research sub. Not long afterward, she came across a battle going on between another submarine, the Alpha Explorer, and the Morrigan, a pirate sub. As Catlantis came to the rescue, the pirate Red Rhianna saw a chance to achieve two goals: acquiring Alex Starr's masker device, and marrying Derek Knight. Thus, the battle began..