Avengers: Age of Ultron is the title of a well-known superhero film in the Marvel Cinematic Universe, not a typical verb. In formal discussion, you might refer to it as the film, or you could verbify the phrase creatively (e.g., “to Avengers: Age of Ultron”) in playful, non-standard usage. In standard usage, treat it as a proper noun/title, not a verb, and pronounce each element clearly in sequence to convey the exact title.
Full pronunciation guide
