More early adventures of The X-Men from the Marvel Age of Comics, collected in a smaller format that's perfect for new readers! In our latest Mighty Marvel Masterworks, the first class of students at Professor X's most uncanny academy - the X-Men - reach new milestones in their evolution. The team grapples with the menace of Factor Three in a massive multi-issue saga. It's a strange and mysterious story that will surprise you with its shocking conclusion. But first, the Juggernaut returns, the X-Men meet Spider-Man and the Mole Man and Tyrannus start a war of the underworlds. Also featured are the 'Origins of the X-Men' backup features that reveal the backstories of Professor X and his teen team supreme! And we're not afraid to go out with a bang: The X-Men's don iconic new costumes as an added treat. Collecting: The X-Men (1963) #30-39 and material from Not Brand Echh (1967) #4