X-Men #53 (1993)

False Fronts: Art by Andy Kubert, Onslaught pulls Jean into the astral plane and casts aspersions on Xavier's character and his dream; Jean refuses to join him (of course) which makes the mysterious villain in Magneto-like costume very mad indeed.

Key book: 1st full appearance of Onslaught, a creation born from the mind of Charles X and Magneto. May 2024 Onslaught is teased on the Disney+ series X-Men '97.