Luka and Doc are shopping together when a group of Gormin crosses their path while one of their Zugormin leaders blasts an acquired coin out of Luka's hand. She is about to attack them when a stranger appears and bribes the Zugormin to walk off so he can talk to Luka in peace. He introduces himself as Cain, an old friend of Luka's and claims he has accumulated a large fortune and now the time has come for them to make her dream come true. However, the entire event was staged as "Cain" is actually Action Commander Vannine, using his power to assume Luka's form while keeping her captive along with the real Cain. Arriving to the Gokai Galleon as the crew were talking if Luka would accept Cain's proposal and leave them, "Luka" arrives on the ship during dinner. Once the crew is asleep, Vannine makes his move in setting up explosive charges before leaving ship to detonate them. Meanwhile, Luka and Cain reminisce about how the former made a promise to collect enough money enough to buy an entire planet for them and the homeless children across the galaxy who have been displaced by the Zangyack Empire to live on. Luka explains to Cain that when she joined the Gokai Galleon's crew, her dream has become even bigger than before as she sees something like Greatest Treasure of the Universe, if as valuable as legends say, would allow her to buy an entire universe with it. Soon after, Vannine returns to announce that he blew the Gokai Galleon up and now intends to kill Luka off. But just as he is about to dispose of Luka, the other Gokaigers arrive to rescue her. They explain that they easily discovered that Vannine was an imposter and after deactivating the bombs he planted, had Fuuraimaru use his illusion technique to stage their ship's explosion to deceive him and follow him to Luka. Enraged that he was tricked as Luka is freed, the Gokaigers fight Vannine. During the fight, as the Gormin hold the others off, Gokai Yellow fights Vannine as the Action Commander assumes her form. After Vannine takes on Gokai Silver's form, the Gokaigers use the Megaranger Keys to expose the imposter before they use the Gokai Galleon Buster to finish him off. After Vannine is enlarged, Gokaioh and Goujyujin have a hard time fighting the Action Commander when he assumes the form of a building to sneak attack them. However, catching on with their heat sensors, Goujyujin cripples Vannine before Hurricane Gokaioh destroys him with the Shushutto Shuriken Chain. Soon after, still wanting to make her dream a reality, Cain bids farewell to Luka while claiming that the happiness she obtained while staying with her fellow pirates is a treasure no money could buy.