The Gokaigers defeated Chirakashizky in order to stop Gaiark's attack on the Gunman World, but end up falling into one of their traps! Turns out that another Gaiark member is attempting to take over Human World! But having saved Gunman World, they now find out that the dimensional door to back to Human World has closed! Sosuke and the Gokaigers head to the Engines home world, "Machine World" where they attempt to get help from a new Engine, Machalcon, and return to Human World but....! Will the new Engine join up with the Gokaigers? Will Go-Onger's Grand Power be unleashed?!