Marvel Studios' Avengers: Infinity War Official Trailer

If you’re merely a casual fan of the Marvel Cinematic Universe, the arrival of the first trailer for Avengers: Infinity War might not seem like a huge deal: After all, pretty much every Marvel movie now feels like an Avengers movie, with the team’s various heroes playing crucial supporting roles in such recent hits as Captain America: Civil War, Spider-Man: Homecoming, and Thor: Ragnarok. What began as a winking, post-credits tease in 2008’s Iron Man “I’m here to talk to you about the Avenger initiative” has become the series’ hours-long, deeply threaded mega-narrative, full of Infinity Stones and intra-squad squabbling, and populated by dozens of characters. At this point, even the Watcher needs Wikipedia to keep up. But Infinity War is the MCU’s biggest gambit yet (and, strictly speaking, its only one), the first part of a reckoning/realignment that will eventually lead to Marvel’s much-discussed “Phase 4,” emphasizing a different squad of heroes and villains. With some of the series...