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"Seeking to unlock the secrets of genetics and genetic mutation, Dr. Nathaniel Essex was a scientist a century ahead of his peers with whom he worked in the 19th century. But when his studies brought him face-to-face with the immortal villain Apocalypse, his studies, and his life, would never be the same! Transformed into something more than a normal man and calling himself Mr. Sinister, Essex has learned much in the last 100 years. Using the X-Men's Cyclops as his prime test subject, Sinister has continued his work on mutants. But Sinister is never satisfied, and he continues to be a threat to mutants and humans everywhere!|
Presented here as he looked during the X-Men crossover event Inferno in UNCANNY X-MEN #240, Mr. Sinister is poised to take overthe world! Using his scientific knowledge, Sinister has cloned one of the originalk X-Men, Jean Grey and created an agent named Madelyne Pryor that has infiltrated the team and used them without their knowledge. Now, Madelyne Pryor and Mr. Sinister have transformed New York into a demonic nexus and ready a final spell to allow a dimension of demons access to Earth!"
Sinister underwent a few minor changes from his debut at Toy Fair 1998. The figure was initially shown with mitten style gloves. The final production figure had painted hands instead.
The Sinister figure also provided us with yet another variant. The initial production of the figure had a black diamond on the forehead (as did the Toy Fair prototype interestingly enough). However, the error was caught early enough in the production run to allow a change to be made to the more correct red diamond. Although it is unknown for sure, it is entirely possible that the black diamond version was produced in smaller numbers than the red diamond version.