For the 2015 event also called Secret Wars, go
Kang the Conqueror
A cosmic entity known as the
Beyonder gathered a large assortment of superheroes and super-villains on Battleworld to see who would win in a fight of good against evil.
Part 1: "The War Begins"
In the blink of an eye, Earth's heroes are gathered together in a construct in space. They are unsure as to what or who had brought them to this
Part 2: "Prisoners of War!"
On the surface of Battleworld the heroes gathered by the Beyonder are attacked by the villains the god-like being has brought here as well. The
Part 4: "Situation: Hopeless!"
The forces of Doctor Doom have forced the gathered heroes to flee and destroyed their headquarters, a victory for Doom and his minions in Beyonder's
Part 6: "A Little Death..."
After trying to escape the X-Men, the Wasp finds herself trying to get her escape ship under control. Unable to figure out the strange controls, the
Part 7: "Berserker!"
The heroes gathered on Battleworld by the Beyonder have discovered someone spying on them at their camp. When the Torch corners her, the mystery
Part 8: "Invasion!"
With She-Hulk in danger at Doombase, the heroes gathered on Battleworld rush to her aid. Their attack attract the attention of the Enchantress who
Part 9: "Assault on Galactus!"
The battle-wounded Colossus exits the rustic building he is healing inside to see Galactus starting up his machine to devour the planet. He re-enters
Part 10: "Death to the Beyonder!"
With the heroes of Battleworld preventing Galactus from trying to consume the planet, Galactus has no choice but to consume his own worldship for
Part 11: "...And Dust To Dust!"
Doctor Doom has stolen the power of the Beyonder and appeared before the heroes gathered on Battleworld. Removing his mask, Doom reveals that his
Part 12: "...Nothing to Fear"
For daring to unite against the omnipotent power of Doctor Doom the heroes on Battleworld have been annihilated for their defiance. Seeing the
Though they were allied with Captain America's faction, the X-Men chose to act as a "third force" in the conflict.
A sequel: was published, with the Beyonder visiting Earth and having a tie-in with almost every Marvel comic book written at the time.
Secret Wars II As revealed in 2015's Deadpool's Secret Secret Wars, Deadpool originally took part in this event, though after a failed romance with Wasp, she wished to forget him so strongly, everyone present did as well. However, he in turn wished for Zsaji's revival, and sent her back to her homeworld. 
Links and References
↑ Deadpool's Secret Secret Wars Vol 1 1
↑ Deadpool's Secret Secret Wars Vol 1 4