"The universe" already covers absolutely everything.
All existing matter, space, time, energy, etc., regarded collectively, esp. as constituting a systematic or ordered whole; the whole of creation, the cosmos.
Everything else you're talking about doesn't actually exist. Sci-fi writers can come up with anything they'd care to. "The multiverse" is pretty standard.
orig. Science Fiction. A hypothetical space or realm of being consisting of a number of universes, of which our own universe is only one; (Physics) the large collection of universes in the many-worlds interpretation of quantum mechanics, according to which every event at the quantum level gives rise to a number of parallel universes in which each in turn of the different possible outcomes occurs.