Kanjar Ro is a supervillain appearing in comic books published by DC Comics. Publication history He first appeared in Justice League of America #3 (February 1961) in a story entitled "The Slave Ship of Space" and was created by Gardner Fox and Mike Sekowsky. Fictional character biography Kanjar Ro is the dictator of the planet Dhor in the Antares star system. Dhor is constantly at war with three other Antarean worlds: Alstair, ruled by the plant-like Queen Hyathis; Mosteel, ruled by the metal-skinned Kromm; and Llarr, ruled by the lizard-like Emperor Sayyar. In his first appearance, he enslaves the Justice League with his Gamma Gong, and uses them to battle the other three monarchs by threatening to leave all humanity in a paralyzed state, to only be released if all three monarchs spoke Kanjar Ro's name at the same time. The League is able to defeat all three monarchs, and also defeat him, despite him taking away the monarchs' voices with his energi-rod (the League had recorded their voices so humanity was freed). The JLA imprisons all four monarchs on a small planet around which Green Lantern creates a power ring barrier. Ro escapes after the four villains make a crack in the barrier with their thought waves, but leaves the other three behind. Ro makes several attempts to conquer Rann, prompting the League to team-up with Adam Strange. He first uses radiation from Rann's Triple-Star to become three times as powerful as Superman and nearly defeats the JLA, but Adam defeats him with his own Dhorite Energi-rod (like Superman is weakened by Kryptonite, Kanjar is vulnerable to Dhorite) and imprisons Ro in a prison with bars of Dhorite. For some reason the yellow radiation he released means Adam cannot stay on Rann for more than a year. While the people of the planet Rann are distracted, Kanjar Ro creates a duplicate of himself from his own aura and leaves it in his place. He then uses the auras of the Flash, Wonder Woman, Green Lantern, the Atom, and Aquaman to create doubles to draw the other members of the Justice League into various traps which Kanjar Ro has devised. The real members of the JLA are able to spot the duplicates as they do not have the same weaknesses or personalities as the real JLA members. Kanjor Ro's duplicate, upset at being left behind, reveals the real Ro's plan