(abbreviation, alt-of, initialism) Initialism of Marvel Cinematic Universe (“a shared universe and franchise of films and other media based on Marvel Comics, introduced in 2008”).
[…] Hydra is a sprawling global organization with highly advanced technology that has opposed S.H.I.E.L.D, the Avengers, and nearly every major superhero group in the MCU.1 2015, Dan Casey, 100 Things Avengers Fans Should Know & Do Before They Die, Triumph Books, published 2015, →ISBN, page 128:
It is interesting to note that, while Coulson is used to suture the various MCU films together and latterly to tie the Agents of SHIELD television show into the MCU, this has not occurred at other points in the franchise. 2015, Colin Harvey, Fantastic Transmedia: Narrative, Play and Memory Across Science Fiction and Fantasy Storyworlds, Palgrave Macmillan, →ISBN, pages 84–85:
Being Letterboxd-pilled is essentially shorthand for saying that you’re into movies more than your typical MCU buff, kind of like what MUBI is to Amazon Prime. 2024 February 29, Jack King, “Why everyone you know is suddenly a Letterboxd head”, in GQ:
It [Ant-Man] will, of course, be firmly planted in the MCU but a different corner than we've seen before. 2013, Kevin Feige, quoted in Laura Ciarolla, "Marvel announces third 'Avengers' film", The Daily Athenaueum (West Virginia University), Volume 125, Issue 86, 30 January 2013, page 3