Cosmos

The Cosmos (also known as The Multiverse) is everything that comprises all of space-time, alternate universes, alternate realities and alternate timelines, including all possible past, present and future events.

Trivia

 * In For a Few Brains More, Ultimate Albedo called it the Omniverse.
 * All of the multiverse except for No Watch Ben's Timeline was briefly erased from the existence by Vilgax via Chronosapien Time Bomb, but restored by Clockwork used by No Watch Ben.