You can find Reign of the Supermen on several official platforms for streaming, renting, or permanent digital purchase:

: Blu-ray and DVD copies are available at retailers like Amazon or Barnes & Noble . Reign of the Supermen [4K UHD] (2019) - DVD Movie Guide

: The movie is available on Max (formerly HBO Max) and can be found on Tubi or Plex via subscriptions or ad-supported versions.

: You can buy or rent a digital copy on Amazon Prime Video , Apple TV , Google Play , and Fandango at Home (Vudu) .