X-Men: Deadly Genesis
2006Ed Brubaker reveals Xavier's darkest secret: before sending the All-New X-Men to rescue the originals on Krakoa, he sent another team (Vulcan, Darwin, Petra, and Sway) who were killed in the attempt. Xavier erased all memory of their existence. Now Vulcan, the third Summers brother, has returned from apparent death with omega-level power and a burning desire for revenge. A retcon that permanently tarnishes Xavier's legacy and launches the Vulcan saga.
6 core issues, 0 optional tie-ins/crossovers
A mysterious mutant awakens and attacks the X-Men; the secret of Krakoa begins to surface
Flashbacks reveal Xavier's hidden team; the cover-up starts to unravel
Vulcan's identity and his connection to Cyclops and Havok are revealed
The X-Men confront Xavier about his lies; Vulcan's power is staggering
The truth about the original Krakoa mission is fully exposed
Vulcan defeats the X-Men and leaves for Shi'ar space; Xavier is stripped of his role; Cyclops is devastated