Synopsis by Hal Erickson
The origin of Mr. Sinister is revealed in this episode from X-Men's 5th season. The year is 1859; the place, London. Dr. Nathaniel Essex, a staunch proponent of the Darwin theory, is convinced that the Mutants are the next logical link in the evolutionary chain. Taking a brief leave from the 20th century, Xavier goes back in time to prevent Essex from conducting experiments on human guinea pigs. But can he save the lovely Mrs. Essex from becoming a mutant herself?