Miley Cyrus Had A Secret Cameo In ‘Guardians of the Galaxy Vol. 2’ Published on March 18, 2021 Entertainment 1998 views Miley Cyrus didn't share screen space with any of the stars in the film, because she was voicing Mainframe, a robot. Miley's voice was distinct as ever in one of the five post-credit movie scenes, and yet very few fans seem to have caught on. More