Red X was originally a cover identity that Robin had conceived as part of an attempt to get closer to Slade. Bent on stopping the threat that the madman presented by any means necessary, Robin approached Professor Chang for the necessary items - particularly Zynothium to use as a power source - to create the Red X suit and, posing as a ruthless master thief, Robin stole several computer chips that Slade was after and offered them with a proposition to forge a partnership between the two. However, Robin's haste in trying to get too close somehow exposed his identity to Slade, and in fear that if he told his teammates about his plans, they would not play their parts convincingly, he chose not to tell them. The plan eventually went awry: Slade revealed his knowledge of Robin's identity, and while Robin managed to retrieve the chips, Slade managed to elude him yet again. Robin was back at square one, with one additional step backwards: he had lost the trust of his friends. Since the Zynothium power core could not be disposed of safely, Robin stored the suit inside a vault in Titans Tower, never to be used again. Some time later, however, the suit was stolen from the vault by an unknown third-party who intended to use it for his own selfish agenda. Because the Zynothium Ore in the suit's power belt was nearly exhausted, Red X stole a handgun-like scanner which he could use to locate it. Not knowing where to look for him, and with Chang's supplier having been revealed to have skipped town, Robin "coerced" Professor Chang into revealing the most likely location where Red X could get his hands on more Zynothium: a highly secured tech company at the city's south end which has a generous supply of Zynothium stored in their vault. Red X managed to penetrate the facility, with the Teen Titans (minus Cyborg) in hot pursuit, but Professor Chang's henchmen were following them, with Chang himself intending to swipe the Zynothium to power a gigantic disintegrator cannon of his own construction, and in an attempt to ensure no interference from Robin, he captured the other Titans and held them hostage. Robin eventually confronted Red X and questioned him about his intentions for stealing the suit, his answer was that he was a thief, not a villain, causing Robin to realize he was not psychotic, just selfish. After being knocked out by Chang's henchmen, and subsequently captured by Robin, he confronted X about his self-serving attitudes, while Red X kept taunting Robin about the one mistake which helped create him. Unimpressed and willing to make amends, Robin went after Chang himself, but almost ended up his victim as well. At the last moment though, Red X saved Robin from certain death and aided him in freeing his teammates, including preventing Chang from attacking the Titans with his disintegrator, and eventually helped Robin bring him down. With Chang defeated, the Titans and Red X were back to being enemies. Red X attempted to abscond with enough Zynothium to last him for "quite a while", until Robin showed Red X that he had secretly swiped his power belt, rendering the Zynothium useless to him. Momentarily surprised by this revelation, Red X complimented him by saying "not bad, kid, not bad", then threw the Zynothium tube onto the ground to create a small explosion to act as a diversion for him to jump off the edge of a nearby cliff and quickly get away. While wearing the suit, Robin/Red X's appearance is that of a person dressed in a completely black bodysuit that features a red 'X' (with the lower-right point elongated to stretch across the chest to the bottom of the right pectoral muscle) placed over the top of the left pectoral muscle, an ash-gray utility belt that features a silver/light gray buckle, a concealed teleportation button (shaped like a circle that features a red 'X', when revealed) in the middle of the buckle, a pair of vertical cylinder-shaped tubes on the back of each pouch and a thin, horizontal red stripe through the middle of the backside, a pair of serrated ash-gray gloves that feature black outlines around the "serrated" portions, a single, large red 'X' on the palms and the back of the hands, a pair of black boots that feature an ash-gray outline around the edge of the soles (which feature an ash-gray version of the skull on the mask, but with red eyes that lack a thick black outline, and a red 'X' below it, on the heel), a black cape that features an ash-gray interior, a black helmet-like mask that features a white skull (that lacks the lower jaw) and a red 'X' placed in the middle of the "face", with the lower-right point of the 'X' elongated to end beneath the right eye. The "eyes" of the mask are white reflective lenses that seem to act like Robin's mask (in terms of expressing emotions) and are thickly outlined in black. he claims to be a thief who is "just looking out for number one", stealing purely for his own gain. He is far less serious than Robin (to the point of commenting that Robin is "taking life way too seriously"), finding his battle with the Titans amusing and voicing numerous quips as he immobilizes them with his gadgets (though when push comes to shove, he too, can be serious). He also flirted with Starfire on one occasion, indicating that he and Robin both share similar tastes when it comes to girls (though it might also be an example of his flippant sense of humor). He is also quite bold: while being confronted by Robin in the Zynothium vault, he threatened to "trip the power core" of his suit, and cause an explosion, despite the obvious fact that he would be disintegrated in the process. Also, when revealing his motives to Robin, he claims to be "not such a bad guy, once you get fo know him”. Despite primarily being a self-serving thief, he is not without noble qualities: he rarely performs acts of true evil and, when the time comes for him to use his powers to prevent certain disaster, he tends to rise to the occasion.