From Henshin Justice:
There’s an old legend about 5 mysterious keys. Once these five keys are gathered, one can find the Greatest Power in space.
The Gokaigers, who left Earth to destroy Zangyack, are now back on Earth
with a black Gokai Galleon, the sail even has a Zangyack emblem. The
original red Gokai Galleon was destroyed in Zangyack’s homeplanet. . The
Gokaigers are now working with Zangyack. The Go-Busters realize they
have to fight the evil Zangyack and the Gokaiger crew. As they fight,
the Gokaigers Gokai Change in both Goggle V and Timeranger.
The Go-Busters manages to capture Navi, and they find out that the
Vaglass are also working with Zangyack. They are also told that they
have to travel back in time. Thus Yoko and J head back to the Edo-era.
There they meet Rat Boy (Nezumi Kozo) a Japanese thief and folk hero.
Turns out that Rat Boy is actually Gai! Gai informs them that he’s there
to help them, and since they are the 36th Super Sentai they have to
show Gai some more respect.
Go-Busters VS Gokaiger will be released in Japanese theaters January 19, 2013.