The Zero Force was the source of pre-primordial power, an energy that predates existence itself. It's the energy that ends one universe and starts another. During the early days of the Fantastic Four, Mister Fantastic discovered the Zero Force in the form of a spark and managed to contain it within Container Zero.
Over a decade later, the Zero Force was unleashed by the alien invader Cormorant when he cracked open Container Zero in hopes it was an item he had been tasked to find by the Helmsman. The Zero Force began to spread, overwriting the universe with another. Before that could happen, Brainstorm channeled and contained the Zero Force into a prototype telepod of her own creation. When fueled by the Zero Force, the telepod became a doorway to every point in space and time and it was dubbed the Forever Gate.
- In Fantastic Four (Vol. 6) #26, Mister Fantastic mentions that he discovered Zero Force "after Galactus. Before Wakanda," which means its discovery is set between Fantastic Four #50 and #52.