JLA/Avengers was a groundbreaking crossover event published in 2003 that featured the Justice League of America and the Avengers teaming up to face a common threat.

Zero Hour: Crisis in Time was a major crossover event published in 1994 that featured the Justice League and the Legion of Super-Heroes working together to avert a temporal catastrophe.

Secret Wars was a groundbreaking crossover event published in 1984 that featured the X-Men, the Avengers, and the Fantastic Four joining forces to battle the Beyonder, a powerful cosmic entity.

Final Crisis was a major crossover event published in 2008 that featured Batman, Superman, and the Justice Society of America joining forces to defeat Darkseid and his forces.

Infinity Gauntlet was a major crossover event published in 1991 that featured the Avengers and the Guardians of the Galaxy joining forces to prevent Thanos from obtaining the Infinity Gauntlet and gaining ultimate power.

Infinite Crisis was a major crossover event published in 2005 that featured the Justice League and the Teen Titans joining forces to confront Superboy-Prime and his allies.

Onslaught was a major crossover event published in 1996 that featured the X-Men and the Fantastic Four joining forces to investigate a mysterious phenomenon that threatened to destroy both teams.

Zero Hour: Crisis in Time was a major crossover event published in 1994 that featured the Justice League and the Legion of Super-Heroes working together to avert a temporal catastrophe.

Avengers vs. X-Men was a major crossover event published in 2012 that featured the Avengers and the X-Men clashing over the fate of a mutant registration act.

Crisis on Infinite Earths was a major crossover event published in 1985 that featured the Justice League and the Justice Society of America joining forces to confront the Anti-Monitor and his forces.

Secret Wars was a groundbreaking crossover event published in 1984 that featured the Avengers and the Fantastic Four joining forces to battle the Beyonder, a powerful cosmic entity.

Infinite Crisis was a major crossover event published in 2005 that featured the Justice League and the Teen Titans joining forces to confront Superboy-Prime and his allies.

Onslaught was a major crossover event published in 1996 that featured the X-Men and the Fantastic Four joining forces to investigate a mysterious phenomenon that threatened to destroy both teams.

Crisis on Infinite Earths was a major crossover event published in 1985 that featured the Justice League and the Justice Society of America joining forces to confront the Anti-Monitor and his forces.

Avengers vs. X-Men was a major crossover event published in 2012 that featured the Avengers and the X-Men clashing over the fate of a mutant registration act.