The year is 2149, humans have colonized various other worlds, and are coexisting with various other races. However, The Principality of Zeon has allied with Teiwaz, as well as the Giganoidian Army, Muticon's Army, Salem's Inner Circle, Uchu Kingdom Galactinsect, the Galactic Empire, and various other foes. Now, the crew of Tekkadan, Celestial Being, and others must join forces with the SSSP, the Huntsmen and Huntresses of Remnant, a dimension-hopping Metal Hero, a dimension-hopping cyborg Kamen Rider, a new squadron of Maximals, the rulers of Chikyu, the Kyurangers, and various other warriors to keep the galaxy safe from evil!
Kamen Riders Zonjis and Zamonas have survived their defeat at the hands of Zero One and the Heisei Riders respectively, and are seeking revenge. They travel through time and recruit other villains to their cause: That being to eliminate and replace the Heisei era at its dawn. This catches Shin and J at the center of it all, where they have the responsibility to stop the two evil Riders from establishing their own twisted future. This will take them across time and space in a clash to save history, and who is that they meet along the way...? Will they be able to overcome such a threat to their very existences?