Following the broadcast of episode five of the show, Kyuranger moves into a new arc.
Episode 5 of Uchu Sentai Kyuranger saw all nine members of the team coming together for the first time. Toei has branded the first five episodes the “prologue” of the show. Episode 6 onward will follow the first official story arc, the “Earth Liberation” arc. As of episode 4, the team has been on Earth, attempting to discover a secret that has brought more generals to it than any other planet in the universe.
Source: Toei TV