Kamen Rider Build Episode 38

Finally, Evolto has transformed into his Phase 4 form, therefore completing his body! Cross-Z, Grease, and Rogue, three strong Riders are no match against his true form! Can they stop Evolto who has regained the ultimate power he used to destroy Mars? Meanwhile, Sento has recovered his memories as Katsuragi once again… (Source: kamenrider.fandom)