Gekirangers are visited by Boukengers when someone from space with ultimate power threatens the existence of Earth

Gekirangers meet the Boukengers when a precious item is stolen from the SCRTC headquarters. Meanwhile, another item in safekeeping of RinJyuDen is also stolen , and they find out that these two items can grant ultimate power when combined. Gekirangers team up with Boukengers to stop the villain from space who threatens to destroy Earth with this ultimate power...—Immanuel A.