Marvel Armageddon

Marvel Armageddon is a storyline leading to Marvel Rebirth. It was published in 2020 by Marvel Comics.

Plot
A future Peter Parker uses the Time Stone to go back six years and warn the heroes of a cosmic threat that destroys the universe. He explains that at some point a Cosmic Cube has been used. He also warns his past self that his company was involved.

Earth is attacked by the Asgardians led by Thor.

The present day, Peter discovers Riri Williams has the Cosmic Cube and used it to become Iron Man. She also used it to cause Civil War II to happen. He is attacked by Riri, America Chavez and Captain Marvel. He is saved by his future self who is killed by Riri.

Realising that the only way to stop Riri is to reverse his deal with Mephisto, Spiderman has Doctor Strange summon the demon. Mephisto tells Peter that if he reverses the deal, Aunt May will die. Peter admits it was wrong for him to make the deal in the first place and he needs to accept May's death. Mephisto reverses the effects of the deal, retconning most of the Marvel Universe that happened after the events of One More Day. Peter finds he is married to Mary Jane again.
 * Tony Stark is no longer in a coma. Nobody has heard of Riri Williams.
 * Steve Rogers is no longer an agent of Hydra.
 * Jane Foster never became Thor.
 * Amadeus Cho never became the Hulk.