This article is a stub. You can help SuperFriends Wiki by expanding it. We have prepared templates as a guide to page creation. (This template will categorize articles that include it into the "Category:Article stubs" category.) RX99 is Lex Luthor's robotic assistant. Appearance Action Comics Vol 1 544 Retrieved from "https://superfriends.fandom.com/wiki/RX99?oldid=79573" Categories: Article stubs Super Powers Robots Artificial Intelligence Super Powers characters DC characters Villains Superman enemies Henchmen Community content is available under CC-BY-SA unless otherwise noted.