Joe and Anthony Russo are directing Infinity War and its follow-up and have been prepping for an Atlanta shoot. The Marvel Studios film also will shoot in Scotland, with both Infinity War and the fourth Avengers pic expected to be filmed back-to-back.

Dinklage, who has the seventh (and penultimate) season of HBO's Game of Thrones due out this summer, has already starred in a superhero film based on a Marvel property, playing the villain Bolivar Trask in 2014's X-Men: Days of Future Past for Fox. The actor has won a Golden Globe and two Emmys for his work as Tyrion Lannister on Thrones.

Infinity War's stars have not officially been announced, but the film is expected to feature the largest cast of characters yet for an MCU pic, with heroes from Avengers films such as Iron Man (Robert Downey Jr.) and Captain America (Chris Evans) teaming with members of the Guardians of the Galaxy and Benedict Cumberbatch's Doctor Strange to fight Thanos (Josh Brolin), the villain who has been teased since 2012's Avengers and who appeared in 2014's Guardians of the Galaxy.

Infinity War takes its name from a six-issue 1992 Marvel Comic series, which is a sequel to a 1991 series called The Infinity Gauntlet. No plot synopsis for the film has been released, but it's likely the Infinity War movie will borrow from the Gauntlet comic, which sees Thanos gather up the Infinity Stones in order to achieve godlike powers. In the MCU films, Thanos has quietly been attempting to claim the stones.

Infinity War is set for a May 4, 2018, release.