This theory also states that the heroes who 'die' at the end of Infinity War are actually trapped in another dimension, possibly inside the Soul Stone. The post-credits scene teases Captain Marvel's arrival, and we're still getting Danvers' origin movie before Avengers 4, so she will likely play a big role in the 2019 film. This fan speculation comes courtesy of Reddit user TruthOfAlecius, who theorizes that Captain Marvel (Carol Danvers) will arrive in Avengers 4 to try and stop Thanos. Thanos gets his hands on all six Infinity Stones in 'Avengers: Infinity War' Marvel Studios Avengers 4 Theories - A Seventh 'Ego' Infinity Stone Could Be The Salvation Of All Your Fallen Heroes