Marina will sich an Doc Terror rächen. Er hat ihren Vater getötet. Sie lockt ihn auf eine Insel, auf der sie ihm eine Falle stellen will. Dabei gerät sie aber selbst in Lebensgefahr.

Doc Terror observes scientist Marina Abbot's ship heading out to sea and sends out sea-borgs to attack it. The Centurions are sent to defend the ship, while Marina summons help from a giant lobster. After the battle, Marina explains to Max that she has taken over her father's research, but wishes to keep it secret. The ship heads to the research base Neptune-1, and the Centurions observe the giant lobster and a giant turtle first hand. Marina tells them that the creatures are to be used by the World Council of Scientists and that each one can be controlled with an implant. She swears not to have her work destroyed by Doc Terror like her father's early research. Ace is later trapped by Marina, who tells him that she wants to lure Terror to the island and take revenge against him for her father. As Terror begins transforming the creatures into cyborgs, the Centurions arrive to defeat them.

Science Lesson: Swan ships by Max.