Navi's latest clue to the treasure is to find a warrior in a sealed forest, which Gai quickly identifies as the Ginga Forest - home of the Gingamen. After Gai explains that the Gingamen protected Earth from a band of space pirates, Doc expresses worry while Gai admits he has no idea where the Ginga Forest actually is. Using Gai's copy of Haruhiko Aoyama's Book of Legends, the Gokai Galleon crew search for the entrance to the Ginga Forest and find themselves walking in circles before Hyuuga suddenly bursts out of the Ginga Forest's invisible barrier, followed by Basco and Sally. The Gokaigers tell Gai who Basco is, but he immediately recognizes Hyuuga. He introduces himself to the man before asking for his autograph. Basco then unleashes Deka Master, Wolzard Fire and Magi Mother to hold off the Gokaigers so he can capture Hyuuga as Gai takes him to a safer place. While Gokai Red is forced to fight Sally to get to Basco, the other Gokaigers are easily defeated by the extra warriors as they are thrown into a river. Fortunately, they are saved by Ryouma; Doc thanks him for saving them, despite not initially recognizing who he is, as he and the others search for Gai and their captain. Meanwhile, Gai tends to Hyuuga's wounds while talking about himself just being a novice compared to him and the past Super Sentai groups. Hyuuga then asks him to give him the Gokai Cellular so he can be able to protect the world again. Despite a long hesitation, Gai is about to give Hyuuga the Gokai Cellular when Basco appears, using his trumpet to siphon the Great Power out of Hyuuga. Gokai Red intervenes to stop Basco, who then unleashes the Black Knight to battle him as the other three extra warriors arrive. Inspired by his captain's refusal to let go of his dream even if the odds are against him, Gai takes the Gokai Cellular before Hyuuga can grab it. However, as the rest of the Gokai Galleon crew arrives, Hyuuga reveals that he was testing Gai's self worth as a protector of the world. Gokai Silver enters Gold Mode to defeat the Black Knight with the Gokai Legendream Final Wave, with Hyuuga regaining the Black Knight Key, while the main five Gokaigers change into the Gingamen to weaken the other extra Sentai warriors. Though Deka Master, Wolzard Fire, and Magi Mother are eliminated by the Gokai Blast, their Ranger Keys are recovered by Sally as Basco unleashes the Moonroid Tsukki. Shinken Gokaioh and Goujyujin engage Tsukki and destroy it with a Gokai Samurai Slash and Goujyu Triple Drill Dream combination attack. Later, Hyuuga hands Gai the Black Knight Key and the Gingamen's Great Power, telling him that the powers of the Super Sentai should be best gathered in one place. As the Gokai Galleon sails off, Ryouma arrives admitting his surprise that the newest Super Sentai team is a bunch of space pirates. Hyuuga asks if his hatred for space pirates is still strong, and Ryouma tells his elder brother that he thinks the Gokai Galleon crew are an exception and admits that he highly respects their friendship.