The Null Void is an alternate dimension discovered by Caesar Salazar during the early stages of the Nanite Project. Caesar believed it to be an empty space, and used it to imprison the rogue Alpha. However, unbeknownst to Caesar, the Null Void was a prison dimension created by the extraterrestrial species: The Galvan of Galvan Prime from another dimension: Ben Tennyson's Dimension. Alpha took control of a mechanical alien criminal in the Null Void, eventually finding his way back to his dimension.

Alpha was later imprisoned in the Null Void a second time by Caesar, Rex Salazar, and Ben Tennyson.