With a snap of the fingers, half of the life in the universe was wiped out. With the help of Captain Marvel (Brie Larson), the nearly desperate Avengers found Thanos (Josh Brolin)'s retreat, but learned that the six infinite gems were destroyed, and their hopes were completely shattered. Five years later, Ant-Man (Paul Rudd), who was lost in the quantum realm, unexpectedly returned to the real world, and his appearance ignited hope for the surviving Avengers. Tony (Robert Downey Jr.), who had reconciled with Captain America (Chris Evans), found a way to travel through time and space, and the scattered superheroes gathered again. They traveled through different eras to collect infinite gems. In the process, Thanos in the parallel universe noticed their plan. The final battle that is destined to go down in history, the superheroes fought one after another for the beliefs they uphold in their hearts...