When the Gokai Galleon crew learns that he has three Great Powers, they take Gai to their ship where he reveals his origins. Days ago, after being hospitalized from risking his life to save a girl from a truck, Gai is visited in his dream by the ghosts of Dragon Ranger, Time Fire and Abare Killer - the latter changing into Mikoto Nakadai as he gives Gai the Gokai Cellular and Gokai Silver Ranger Key. However, after Gai reveals that he is yet about to activate the Great Powers, he is allowed by Captain Marvelous to search the chest for the Time Fire, Dragon Ranger, and Abare Killer Keys. Once the keys are found, Captain Marvelous confiscates them, the Gokai Cellular, and the Gokai Silver Key from Gai. But seeing Gai determined to fight, though not realizing the disadvantage of becoming a wanted man, Marvelous asks him if he has anything to offer him like the rest of his crew. The next day, while thinking of what use he can be to the crew, Gai responds to a Zangyack attack led by Action Commander Osogain at a construction yard. Despite not being able to change into Gokai Silver, Gai fights a losing battle until the Gokai Galleon crew arrives. Seeing his unrelenting courage and determination against all odds, Captain Marvelous hands Gai his phone and key, officially making him a member of the crew after liking his answer to take out the Zangyack Empire. After finishing off the Gormin, despite a brief mix up with the King Ranger Key, the Gokaigers use the Shinkenger Keys to take out the Zugormin. The five main Gokaigers then change into different silver-colored warriors to weaken Osogain before Gokai Silver destroys him with the Gokai Supernova Final Wave. When Osogain and his Zugormon are enlarged, Gokai Silver uses the Time Fire Key to summon the Goujyu Drill time jet. Gokai Silver then proceeds to use the Dragon Ranger Key and then the Abare Killer Key to respectively convert his mecha into the dinosaur mode Goujyu Rex and then the robot mode Goujyujin to destroy the Zangyack forces with the Great Powers of the three Sentai teams. Later aboard the Gokai Galleon, despite being a cabin boy, Gai looks forward to working with the Gokaigers as they prepare an all-night celebration.