As the Avengers and their allies have continued to protect the world from threats too large for any one hero to handle, a new danger has emerged from the cosmic shadows: Thanos. A despot of intergalactic infamy, his goal is to collect all six Infinity Stones, artifacts of unimaginable power, and use them to inflict his twisted will on all of reality. Everything the Avengers have fought for has led up to this moment, the fate of Earth and existence has never been more uncertain.—Marvel Studios
Tom Holland was not allowed to read the script for this movie, since he revealed too many secrets for Spider-Man: Homecoming (2017). In one of the promotional videos for the movie, several of its cast members are in an interrogation room refusing to reveal any spoilers, and Holland’s mouth is conspicuously taped shut.