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X-Men 3 - timeline
Professor Charles Xavier and Erik Lehnsherr meet Jean Grey.
Warren Worthington III tries cutting off his angel wings but is discovered by his father.
Worthington Labs introduces a vaccine that claims to eradicate the X-gene, leading to violent uprisings from mutant factions that resulted in the destruction of the Golden Gate Bridge. Recognizing the need to improve human-mutant relations, the President appoints Beast as ambassador to the UN.
Wolverine kills the resurrected Jean Grey, who became Dark Phoenix and killed Scott Summers and Professor Charles Xavier. Erik Lehnsherr (Magneto) is cured temporarily. Xavier returns to life in another body. (New York City, New York)