Collects Adventures of the X-Men #1-6, Adventures of Spider-Man #3. Animated-style adventures from one of the X-Men’s greatest eras! Wolverine takes on the savage Hulk — but whose side are Havok and X-Factor on? And what does the gamma-powered Leader have to do with it all? Meanwhile, Beast and Gambit face the evil machinations of Mister Sinister — with a little help from Spider-Man! Things take an occult turn for Cyclops, courtesy of the demonic N’Garai and the Dweller-in-Darkness! And when Magneto and his Brotherhood commit an act of war, the X-Men must respond — but as the situation explodes out of control, it just might bring about the Apocalypse…with a capital ‘A’! Who will be left standing in the ultimate survival-of-the-fittest battle?