Gokai Change Explained (Gokaiger vs. Gavan)
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The movie begins with the Gokai Galleon being attacked by Gavan's ship, the Dolgrian. Despite using the Galleon Cannons, Electronic Star Beast Dol separates from Dolgiran transforming into its Dragon Mode and takes out the Galleon. Gai witnesses the ship's crash landing from the ground while getting food. Marvelous and the crew escape the Galleon, but are intercepted by the legendary space sheriff.
On board the Dolgiran, the Gokaigers come to the realization that Gai was still free. When the Gokaigers are brought into a indoor stadium, they are met by armed Space Police and Chief of Space Police WeevalIcon-crosswiki. As the pirates are led to the gallows, Gavan questions Weeval about the specifics of the Gokaigers' acts of piracy when they proclaimed their innocence. Weeval says that he doesn't need to hear their claims, but Gavan says that they have to follow procedure as Space Police. Ashurada congratulates Gavan on his ingenuity for using the pirates to flush him out. However, he introduces Gavan Bootleg. Gavan tells the Gokaigers to run as he'll handle the last of them. After tossing their Mobirates to them, Marvelous notices a familiar hand signal that Gavan gives. Marvelous is left spaced out as the other Gokaigers tranform to fight off the Gormin until Gai and GoZyuDrillIcon-crosswiki appears and rescues the Gokaigers. With the pirates out of the way, Ashurada has
Joe tells Marvelous that he (Marvelous) owes Gavan his life for that act. Basco then calls Marvelous to give him information on the fate of Gavan.
At the same time, the Gokaigers meet Basco, who tells them that Gavan was taken into Makuu Space, a parallel dimension created by the revived Crime Syndicate Makuu made of malicious energy. Ashurada explains that Gavan had dismantled the Makuu Syndicate, leaving the space to collapse significantly, and Ashurada reveals that he is related to their original leader, Don HorrorIcon-crosswiki and has inherited his blood. Ashurada's plan is to catalyze his blood to expand the Makuu Space. Insarn explains to a confused Dyrandoh that "catalyze" means torturing Gavan to arouse the blood of Don Horror, and she realizes that the Makuu Space's expansion could consume Earth. Basco tells the Gokaigers that Gavan is purportedly at the top floor of the Makuu Prison, the worst in the universe. To further the challenge, Basco says that no one has escaped the prison in its 2,600 years of existence. He leaves the Gokaigers with a warning to Marvelous not to go there.
Oddly, the six see a man who appears to be Gavan, walking while coaching a panda in how to walk upright. Gai notes that it's not Gavan, but rather Shirou AkebonoIcon-crosswiki, formerly known as Battle Kenya of Battle Fever JIcon-crosswiki. Joe is further confused when another man who also looks like Gavan shows up with a cart, this time Daigoro OumeIcon-crosswiki, who used to be DenziBlue. While Luka notes their similarities in appearance to Gavan, Gai dismisses her comment, by saying the way they smell can tell them apart.
However, through this, Shirou and Digoro tell them to use the Battle Kenya and DenziBlue Ranger KeysIcon-crosswiki to generate a portal leading to the prison using those team's Greater PowerIcon-crosswikis. Before they set off, Marvelous says that he should go alone, but Joe says that Gavan set his path to becoming a pirate and that they'd do as they wish since that was what it meant to be a pirate. The Gokaigers successfully break into the prison while Gavan is brutally whipped by Gavan Bootleg. The Gokaigers discover that villains and former villains such as JealoustoIcon-crosswiki, BaeIcon-crosswiki, VancuriaIcon-crosswiki, Dark ShadowIcon-crosswiki, the remnants of GaiarkIcon-crosswiki's ministry, and others are being held captive. After their cover was blown after the immense ruckus the former Sentai villains made in wanting to get out and a Gormin finds them, the Gokaigers freed the villains and fought the incoming horde.
Joe and Gai take the Gormins on by transforming into the boxing Rangers, DenziBlue and Go-On Gold while their teammates try to find Gavan. The Zangyack used the Makuu CIty to delay the Gokaigers, with each door now a portal to other locations. Luka and Doc fight the family of the Sneak BrothersIcon-crosswiki as HurricaneYellow and Battle Kenya, while Marvelous and Ahim reach the next floor to find themselves near the ocean to fight Robogōgu of the 10-saiIcon-crosswiki as Gosei Red and Gosei Pink. They then mysteriously get sent to a forest and briefly fight Kinggon of the BigfootIcon-crosswiki, then once more to a quarry to fight Great King Mons DrakeIcon-crosswiki. Ahim uses the Twistornado card to divert Mons Drake's attention while Marvelous flies for the final door.