Monitor of Earth-51, Nix Uotan is the "youngest" of all the Monitors. He is first seen at the beginning of "Countdown to Final Crisis", a nameless Monitor with only minimal distinguishing features, seeking guidance at the Source Wall regarding the rising tensions in the Multiverse. Being informed by the Source that the "Great Disaster"—a long-foretold event that would herald the end of the Monitor race—is approaching and that only Ray Palmer can stop it, he determines to keep Palmer's presence on his world a secret from his brethren. He is next seen on Earth-12, where he confronts Bob in an attempt to stop his efforts to find Ray Palmer, who is "living a life of no consequence" in the relative safety of his own assigned world. When the Challengers (Donna, Jason, and Kyle) are brought to Earth-51, at last finding Ray Palmer there, Bob and Solomon bring the Monitors to this Earth in hopes of destroying Palmer. The Monarch uses this opportunity to put his Multiversal army at war against the Monitors, a war that ultimately lays nuclear waste to all of Earth-51. Nix Uotan sends the Challengers to Apokolips to confront Darkseid; he is left alone in his desolate universe, and begins its rebirth. After events on Apokolips, the Challengers are sent to the reborn Earth-51 by Solomon, infecting it with Karate Kid's Morticoccus virus, and causing the "Great Disaster", thus destroying that world a second time. In the final issue of "Countdown to Final Crisis", the Challengers (now Donna, Kyle, Ray, and Forager) confront the Monitors with the promise they will be watching them and protecting the Multiverse; Nix Uotan defends their choice, and joins their ranks in a reconstituted group of Challengers.