Onslaught

Published from 1996 to 1997 by Marvel Comics, the 'Onslaught' saga was a major crossover event that spanned multiple series. The story was primarily written by Scott Lobdell and Mark Waid, with art by Joe Madureira, Andy Kubert, and others. The arc centers around the emergence of Onslaught, a powerful psionic entity born from the consciousness of Professor Charles Xavier and Magneto. Onslaught becomes a formidable threat to the Marvel Universe, leading to a massive confrontation involving the X-Men, Avengers, Fantastic Four, and other heroes.

The event begins with Onslaught's attack on the X-Men, revealing his intent to reshape the world according to his vision. As Onslaught's power grows, he captures Franklin Richards and Nate Grey, two of the most powerful mutants, to harness their abilities. The storyline culminates in a climactic battle in Central Park, where the combined forces of Earth's heroes confront Onslaught. The battle results in the apparent sacrifice of the Avengers and Fantastic Four, who are absorbed into a pocket universe created by Franklin Richards, setting the stage for the 'Heroes Reborn' storyline.

The 'Onslaught' saga had significant repercussions in the Marvel Universe, leading to the temporary absence of several key characters and the restructuring of the X-Men titles. It was a commercial success and is remembered for its ambitious scope and impact on Marvel's continuity.