Revisit the storyline that changed the 90s for Marvel! Now collected in one massive Omnibus! X-MEN/AVENGERS: ONSLAUGHT Written by Various Art by Various Onslaught is here! The fury of Magneto plus the psionic might of Charles Xavier equals very bad news for the Marvel Universe! Now, discover how this mental monster came to be — and the full extent of the havoc he wreaked on the X-Men, the Avengers and pretty much everybody else! As the truth slowly dawns about the nature of the evil they face, how much are Marvel’s greatest heroes prepared to sacrifice to save the world? Discuss!