The Multiverse is the collection of alternate universes that share a universal hierarchy; it is a subsection of the larger Omniverse, the collection of all alternate universes. A large variety of these universes were originated from another due to a major decision on the part of a character. Some can seem to be taking place in the past or future due to differences in how time passes in each universe. Often, new universes are born due to time traveling, and another name for these new universes is an "alternate timeline". There is "literally a transfinite number, that is, a number greater than infinity" of universes in the multiverse.
|newuniversal: Everything Went White||newuniversal #1–6|
|Doom 2099: The Complete Collection By Warren Ellis||#24-39 and material from 2099: The World of Doom|
|Timestorm 2009/2099||1-4, Spider-Man One-Shot, X-Men One-Shot|
|Spider-Man 2099 vol. 1||#1-10|
|Spider-Man 2099 vol. 2||#11-14 & Annual #1|
|Marvel: The End||#1-6|
|Universe X Vol. 1||???|
|Universe X Vol. 2||???|
|Paradise X Vol. 1||???|
|Paradise X Vol. 2||???|
If you can think of any other trades that should be added to this list please let me know. Stuff like Marvel Zombies I am just going to make a separate list.