Uncanny X-men #233 Marvel Comics (1963)

The X-Men are in Colorado dealing with a rampant Brood outbreak. Meanwhile, Madelyne Pryor has a vision that may spell the end for her and Cyclops.

Rogue and Psylocke switch sides, while the X-Men are forced to fight against other mutants, because of Temptress, a mutant who is manipulating their actions through pheromones. Madelyne Pryor has a foreshadowing dream about losing her life and all that she holds dear to Jean Grey.