"Calvin Rankin (Earth-12)" VS "Calvin Rankin (Earth-616)"
Calvin Rankin (Earth-12)
Calvin Rankin, aka Mimic, was born a mutant who could mimic other superhuman abilities. His father, Ronald Rankin, was a brilliant scientist, but a terrible businessman. All of his discoveries and creations were stolen from him. Calvin grew up poor and under the thumb of a bitter, dejected man.[2] After he discovered the identities of the original X-Men by mimicking their powers, the angry Calvin decided to use his powers for evil and joined the Brotherhood of Evil Mutants. Following his first fight with the X-Men, the other members of the Brotherhood abandoned him, leaving him to be arrested. While in prison, Calvin was visited by Professor Charles Xavier who offered him a position in the X-Men. Calvin accepted the offer and soon became one of his world's many champions. Eventually, Calvin even outshined the more reserved Cyclops and became the team's leader. Some time later, Mimic was plucked from his native reality by the Timebroker to join his inter-dimensional team of mutants, the Exiles, in order to repair damage done to various realities in existence. Mimic was told that his reality was affected by these events and that if he did not repair the damage done, his reality would change to one where he would have killed forty-seven innocent people trying to kidnap Senator Robert Kelly as a member of the Brotherhood and ended up on death row upon capture.[3] (As the Timebroker has since been revealed to be a facsimile and the true reason for the Exiles to have been revealed, it is unknown if there is any validity to this warning, or if the insectoids residing inside the "Crystal Palace" manufactured the story in order to coax Mimic into joining their cause.[4]) On a world where all super-humans had been confined to prisons, the Exiles' first mission was to find "the one who would lead them". They erroneously believed it was the Charles Xavier from this reality who was destined to lead them. Freeing Xavier, they found that he was an evil mutant who was bent on exterminating the human race in revenge for his imprisonment. Due to their error an entire town was mind wiped by this evil Xavier. Mimic was forced to kill the evil Xavier by extracting his claws into the evil mutant's head, or face his own death. This action profoundly affected Mimic who couldn't work past the fact that he was forced to kill his own mentor, even if it was an alternate reality version of him that was evil.
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Calvin Rankin (Earth-616)
Calvin Rankin (also known as the Mimic) first gained his mimicking abilities after a lab accident involving one of his father's dangerous experiments. He was a villain-turned-hero-turned-villain who joined the X-Men, and for a short time was the deputy-leader of the team.[7] The Mimic's main quest had always been to find a way to make his abilities permanent. On this quest he battled the X-Men, the Hulk, Super-Adaptoid, Puppet Master, and Factor Three, as well as serving Onslaught and briefly joining Excalibur. He retained his powers after M-Day and was held prisoner by the Thunderbolts for his past crimes until being offered a place on Norman Osborn's X-Men. After receiving help from the Jean Grey's School X-Men, Calvin was offered a spot on their team, which he accepted. Calvin Rankin was the son of a scientist who was working on various dangerous experiments. As a child, he was not allowed into his father's quarters where the experiments took place. However, at a young age, curiosity got the best of him. While inside his father's lab, he accidentally knocked down a beaker filled with an experimental chemical, causing the formation of a red gas which he breathed in. The experiment his father was working on altered his body. As the months and years passed, Calvin would be more frequently able to mimic the abilities of others while near them.