The Marvel Cinematic Universe is a franchise consisting of film and television adaptations of Marvel Comics publications produced by Marvel Studios. The franchise is notable for being the first superhero film franchise to have characters and plot points from different titles crossover.
Andy Serkis is an actor well-known for helping to pioneer the use of motion capture in film. Interestingly, in the MCU he does not perform a character using motion capture, but instead portrays Ulysses Klaue in Age of Ultron. He did advise Mark Ruffalo on motion capture to help him in his performance of The Hulk, however.