The buildup to Marvel's darkest hour continues as the X-Men face danger from without and within! What decades-old connection does Professor X have with the secretive Clan Destine? When Synraith returns, the two teams clash - but all is not what it seems! Can the X-Men solve the mystery before Synraith's victory is complete? Then, Generation X guest-stars as Cannonball and Husk return home - but find Humanity's Last Stand waiting! Plus: The X-Babies return, Wolverine takes on Bloodscream, and the Dark Beast targets Bishop. But the real danger lurks in the X-Men's basement! And when Sabretooth finally tears loose, one longtime teammate pays the price! Do the X-Men have what it takes to stop Sabretooth once and for all? Collecting X-MEN/CLANDESTINE #1-2, UNCANNY X-MEN (1963) #327-328 and ANNUAL '95, X-MEN (1991) #46-49, X-MEN UNLIMITED (1993) #9, and SABRETOOTH SPECIAL (1995).