Wolverine Volume 2 #53. "Evolution," part 4. Tthe biggest, best and, quite possibly, last battle between Wolverine and Sabretooth. These sworn foes have been locked in an endless grudge match that goes back longer than either can remember -- or even imagine. That stalemate is about to end. For real. The key to victory is eons old, and one of them is about to find it. It's gonna be bloody.