Justin M. Gross (born July 9, 1962) is an American voice actor. Gross is best known as the voice of Arthas Menethil in Warcraft III, Ryu Hayabusa in the Ninja Gaiden games, and Steve Rogers/Captain America in the Ultimate Avengers series. He has also voiced thousands of media projects, such as television and radio commercials, show narrations, promos, websites, and B2B videos. Gross currently resides in Grass Valley, California, where he works primarily from his home studio. He graduated from Sonoma State University.