Promoted as the climax of the series, Kamen Rider Zi-O the Movie: Over Quartzer will introduce the Quartzers, the managers of time, who appeared after Sougo has finished collecting all Ride Watches. A grand conspiracy behind the birth of the king is revealed. These Quartzers are Kamen Riders whose designs are based on Riders who are technically Heisei Kamen Riders, but are not considered as part of the main Heisei Kamen Rider line-up by Toei.
These Kamen Riders are: Balrckx (played by ISSA), Zonjhis (played by Papaya Suzuki), and Zamonas (played by Syuusuke Saito). The film will feature a theme song performed by ISSA and it will be directed by veteran Kamen Rider director Ryuta Tasaki. Kamen Rider Zi-O the Movie: Over Quartzer is set for a July 26th release.
[Source: Natalie via JEFusion]