His only advantage being his superior hand-to-hand combat prowess as a member of Krypton's military as well as his ruthless mindset and courage in battle. In his Daxamite iteration, he shares the race's genetic vulnerability to terminal lead poisoning. In his Kryptonian iterations, he is vulnerable to kryptonite. In both iterations, he is vulnerable to the radiation of a red sun which cancels out the yellow solar radiation flourishing in his cells and subsequently neutralizes his abilities. His virtual invulnerability offers no protection against mind control or magic nor can it withstand the force of several atomic bombs without causing him sufficient injury; he is also vulnerable to opponents of superior strength such as Doomsday nor can he outrun Speedsters such as the Flash. In the prequel comic to "Man of Steel" (which is set thousands of years in the past), Dev-Em I is portrayed as a Kryptonian in training who begins killing his competitors but is caught and put on trial for doing so. Despite this, he was able to escape prosecution on Krypton and managed to make his way on a scout ship during a Kryptonian expedition to Earth. Dev-Em killed the entire crew on the ship, with the exception of Kara Zor-El. He is killed in a struggle with Kara, as the ship crashes on Earth. Kara is seen leaving the wreckage, which would later be known as the "Fortress of Solitude". Dev-Em appears in the TV series "Krypton", portrayed by Aaron Pierre. In this continuity, Em is a new Kryptonian soldier of the Sagitari (Kandor's military) intended to wed his superior, Lyta-Zod. Dev-Em II appears in the film "Man of Steel", portrayed by Revard Dufresne. He appears as one of General Zod's followers and belongs to the same House of Em.