Issue: #217
After his bruising encounter with Cyclops and Emma Frost, Professor X is forced to revisit the biggest challenge and the biggest failure of his career: Logan. But the layers of lies hide one last, deadly secret which goes back to the days of the X-Men's founding, and the Professor's timing couldn't possibly be worse...
First appearances: Tithe
Creators: Rain Beredo, Nathan Fairbairn, Scot Eaton, Tom Van Cise, Cory Petit, Jason Keith, Andrew Hennessy, Mike Carey
Characters: Daken, Wolverine, Professor X, Sebastian Shaw, Moira MacTaggert, Leonine, Miss Sinister, Tithe, Castlemere
Story arcs: Original Sin