Uncanny X-Men, Vol. 1 #221 - CGC 9.6 (WP) - 1st Appearance of Mister Sinister

1st Appearance of Mister Sinister (Nathaniel Essex)

Nazà© and Storm continue looking for Forge at the Grand Canyon. Meanwhile, the X-Men have taken off to San Francisco to protect Madelyne Pryor from the Marauders. All goes well...until one mind-controlled magnetic Marauder shows up!