After successfully resisting multiple cosmic-level threats, the Avengers are facing an unprecedented challenge - a mysterious power "space-time rift" that can control time and space is gradually engulfing the dimensional structure of the real world. The source of this power is an unknown relic of an ancient civilization. It was accidentally activated, causing chaos and disaster across time and space. In order to repair the broken reality and prevent the collapse of the universe, the Avengers must travel through different timelines and parallel universes to find ways to close the rifts in time and space, while facing various enemies from the past, present and future.
