From Marvel Studios News:
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The already massive Avengers: Infinity War cast is expanding. With all the superheroes running around, they are going to need some villains to fight. Thanos (Josh Brolin) is going to be powerful enough once he has the Infinity Gauntlet, but it never hurts to have backup and now we know he’ll have some.
Terry Notary, who did the performance capture for the titular king in Kong: Skull Island, has confirmed his role in the next Avengers film (and possibly the one after it) to The Hollywood Reporter.