While joined in their fight by investigator Ryu Terui, who transforms into , the mystery of Philip's past, his relation to the Sonozaki Family, and their Museum organization are revealed.
With the franchise's fandom growing, more of Ishinomori's grasshopper heroes will soon be riding to the West.
While the police are powerless to stop the Dopants, Shotaro and Philipp can each transform into one-half of Kamen Rider Double, a powerful masked warrior who is the only one capable of stopping this new monstrous threat.