Almost all of these superhero adventures will be opening in the U.K. just slightly ahead of their U.S. release, with the exceptions of Thor: Ragnarok (July 28, 2017) and Captain Marvel (July 6, 2018), which will premiere on the same date domestically and internationally.
Captain America: Civil War will open on April 29, 2016 in the U.K. and May 6, 2016 in the U.S., while Doctor Strange is set to debut in the U.K. on October 28, 2016, ahead of its domestic bow on November 4, 2016.
Guardians of the Galaxy 2 is set for a U.K. release on April 28, 2017, one week ahead of the May 5, 2017 U.S. debut. Fans in the U.K. will get to see Black Panther on October 27, 2017, before the U.S. release on November 3, 2017. The long-awaited Avengers: Infinity War Part 1 hits U.K. theaters on April 27, 2018, before it arrives stateside on May 4, 2018.
Rounding out the slate is The Inhumans, arriving October 26, 2018 in the U.K. and November 2, 2018 in the U.S. and Avengers: Infinity War Part 2, which closes out Phase Three in the U.K. on April 26, 2019 and on May 3, 2019 in the U.S.
It's worth noting that, earlier this week, the Marvel U.K Twitter feed released logos for Doctor Strange, Black Panther, The Inhumans and Captain Marvel that all feature the domestic release dates, so it's possible that these release dates aren't entirely accurate.
4 new Marvel titles are debuting in Phase 3. Which one are you most looking forward to? pic.twitter.com/jKI66DsAvt— Marvel UK (@MarvelUK) November 2, 2014