The nostalgia factor is strong when yours truly revisited Uncanny X-men vol. 1 # 234, one of the first X-men comics he ever read.
It turned out to be a great issue, set in the middle of the team's period in the Australian outback. Madelyne Prior, Scott Summers' estranged wife, was functioning as the X-men's tech support gal, operating the massive computer complex underneath their new headquarters.
So far so good... but once Maddie discovered her husband was part of X-Factor along with his first love Jean Grey, she quite understandably got pretty miffed. Her intense anger made her susceptible to the machinations of Limbo's prime demon S'ym, who sought a powerful minion who could quite literally unleash hell on Earth... Madelyne proved to be a perfect and welcome pawn, as she began her slow transformation into the Goblyn Queen...
As the Queen-to-be, Madelyne suddenly developed several powers. Immunity to mind control for one... Quite a shocker for Claremont... AND the Genoshan genengineer who wanted to turn Madelyne in a mindless mutate in service of Genosha.
An attempt at mind control that failed? Ouch... that's gotta smart!