I'm probably off, but in the Marvel Universe wasn't Mr. Sinister secretly "Jack The Ripper" or something in the late 1800's (where the "murders" were actually part of Sinister's kidnapping and experimentation on early mutants)?
This post went right by me back in the day, because I was completely unfamiliar with the character.
He was introduced in X-MEN right around the time I lost interest and stopped reading, toward the end of John Romita Jr.'s run, circa X-MEN 211.
And Mr. Sinister was introduced and gradually unveiled right after, across
X-MEN 212-221.
https://readcomiconline.li/Comic/Uncanny-X-Men-1963/Issue-212?id=22901A bit more easily accessed in the current era.
God bless the internet !
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