Early X-Men issues introduced the original team composed of Cyclops, Marvel Girl, Beast, Angel and Iceman among a few others, their archenemy Magneto and his Brotherhood of Evil Mutants featuring Mastermind, Quicksilver, Scarlet Witch, and Toad. The comic focused on a common human theme of good versus evil and later included storylines and themes about prejudice and racism, all of which have persisted throughout the series in one form or another. The evil side in the fight was shown in human form and under some sympathetic beginnings via Magneto, a character who was later revealed to have survived Nazi concentration camps only to pursue a hatred for normal humanity. His key followers, Quicksilver and the Scarlet Witch, were Romani. Only one new member of the X-Men was added, Mimic/Calvin Rankin, but soon left due to his temporary loss of power.
The title lagged in sales behind Marvel’s other comic franchises. In 1969, writer Roy Thomas and illustrator Neal Adams rejuvenated the comic book and gave regular roles to two recently introduced characters: Havok/Alex Summers (who had been introduced by Roy Thomas before Adams began work on the comic) and Lorna Dane, later called Polaris (created by Arnold Drake and Jim Steranko). However, these later X-Men issues failed to attract sales and Marvel stopped producing new stories with issue #66, later reprinting a number of the older comics as issues #67–93.