11 Scenes From the New Avengers: Endgame Trailer That Are More Important Than You Think

There have been a lot of theories about how Scott manages to escape the Quantum Realm and come out to aid the Avengers. From what we see of the trailer, it looks like he isn't stuck there for very long and escapes just in time to learn that half the population is gone. Though time is a little wonky in the Realm, so he could have been in there for 30 years and just pops out in time to help out.