SKW Prologue: Kaizoku Sentai Gokaiger Returns

SKW Prologue: Kaizoku Sentai Gokaiger Returns (Kaettekita Kaizoku Sentai Gokaija) is a free-to-watch online movie release for Gokaiger, and a tie-in to Superhero Keyblade Wars. It is similar to the V-Cinema epilogue movies for almost every Super Sentai season, starting from Shinkenger, and it revolves around how the Gokaigers first got involved with the Superhero Keyblade War.

Plot
3-5 years after the fall of Zangyack, Gai Ikari is enjoying a peaceful summer vacation on Earth. One day he decides to visit the Sentai Café Himitsukichi, but on the way back home, Gai is attacked by a mysterious stranger wielding a "key-blade". The stranger defeats Gai just shortly after he morphs into Gokai Silver, and takes his morpher away from him. When Gai questions the stranger, he simply responds, "The age of the Super Sentai is coming to an end..." before leaving for parts unknown.

In the Gokai Galleon, Navi informs the crew that someone is attacking Earth and stealing Ranger keys from all of the Super Sentai. The Gokai crew lands in Tokyo to find it under seige by remnants of the Zangyack and a helpless Gai being harassed by Gormin Sailors. The Gokaigers dispatch the grunts and learn about the stranger who took away their friend's powers, and that the Zangyack, along with other enemy organizations the Super Sentai had previously defeated, have been united by an evil space empire even bigger, stronger, and far worse than Zangyack, but before Ikari can elaborate further, more enemy footsoldiers led by a demonic looking robot attack the Gokaigers and try to kill them. Fortunately, they are teleported out of the city in beams of light.

As their vision recovers, the six find themselves in a high-tech facility unlike anything they've ever seen. A knight in strange-looking armor greets them, saying they are in the Hall of Heroes (where the spirits of deceased heroes reside) and identifying himself as GOTHOH. GOTHOH tells the Gokaigers that the whole universe is under attack by the Super Evil Empire Demonizer, who wants to exterminate all of Earth's heroes and control the universe with an iron fist. He also says that the Demonizer emperor wants all of the Ranger keys and many other powerful objects so he can become the strongest being in the universe and abuse their powers for his evil purposes. Fortunately, GOTHOH already managed to recover the Zyuranger keys and gives them to the Gokais before they (except for Gai, who stays in the Hall of Heroes for his own protection) return to Earth. Also, Gai Yuki is sent by GOTHOH on a mission to recruit as many Rangers, who haven't lost their powers to Demonizer or not yet attacked by them, as possible.

Upon finding the Demonizer squad leader that almost killed them, Marvelous asks if he is responsible for stripping Gai of his Gokai Silver powers. The Demonizer squad leader replies that he is neither responsible, nor affiliated with, or even aware of the real culprit, but will destroy anyone who gets in his way. The Gokaigers morph into the Zyurangers and decimate the grunts. Marvelous is overpowered by the squad leader, but he is saved by Kiba Ranger. The Rangers then use the Howling Cannon on the squad leader and retrieve the Oh Red Key. The Demonizer squad leader grows giant and tries to step on the Gokais, but Kiba Ranger buys them enough time to summon the Gokai Machines, which attack the evil robot further and then fuse into GokaiOh. Mimicking DaiZyuJin's finisher, GokaiOh severs the evil robot's arm, but it still proves to be a formidable opponent, until the Oh Red Key suddenly starts glowing. Gokai Red uses the key's power to summon a new mecha, the OhKen Racer, which attacks the evil robot and then combines with GokaiOh to form Buster OhRan GokaiOh and finish the off the evil robot.

GOTHOH contacts the Gokaigers, telling them that there are many "other heroes" trying help the Super Sentai defeat Demonizer, and that they should team up so they can stand a chance of defeating the evil empire. The Gokaigers assure Gai that they are are going to get his powers back from the man who stole them before they and Kiba Ranger split up to go find the other heroes fighting Demonizer and bring them all together in order to win what is perhaps the greatest conflict in history:

The Superhero Keyblade Wars!

Villains

 * Demonizer
 * Squad Leader
 * DeathTroopers
 * Zangyack
 * Ackdos Gill
 * Warz Gill

Others

 * Navi
 * GOTHOH

Cast
Ryota Ozawa as Captain Marvelous (Gokai Red)

Yuki Yamada as Joe Gibken (Gokai Blue)

Mao Ichimichi as Luka Millfy (Gokai Yellow)

Kazuki Shimizu as Don Dogoier (Gokai Green)

Yui Koike as Ahim de Famille (Gokai Pink)

Junya Ikeda as Gai Ikari (Gokai Silver)

Toshihide Wakamatsu as Gai Yuki (Black Condor)*

Yuuta Mochizuki as Geki (Tyranno Ranger)*

Keiichi Wada as Ryo (Ryu Ranger)*

Wataru Abe as Kou (Kiba Ranger)*, and Byakkoshinken (voice)

Yukari Tamura as Navi (voice)

Takayuki Miyauchi as GOTHOH (voice)**

Hideaki Tezuka as Demonizer Squad Leader (voice)**

Hirofumi Nojima as Warz Gill (voice)***

Shinji Ogawa(r.i.p.) as Ackdos Gill (voice)***

Hiro Shimono as The Mysterious Stranger**

* Legendary Ranger

** New Character

*** Flashback Cameo

Songs

 * Theme of Kaizoku Sentai Gokaiger
 * Theme of Kyoryu Sentai Zyuranger (Instrumental)
 * Theme of Gosei Sentai Dairanger (Instrumental)
 * Fighting Spirit Ablaze! Red Puncher! (Instrumental)
 * The Courageous Space Pirates (Ending Theme)

Continuity and Placement
The movie takes place nine months after episode 29 of Zyuohger at the earliest, and concurrently with the first episode of Superhero Keyblade Wars, as Sora and Marvelous haven't met each other yet.