The Metal Brothers (鋼鉄兄弟, Kōtetsu Kyōdai) are a vocal group composed of Hironobu Kageyama and Masaaki Endoh as the fictional Metal #1 (鋼鉄1号, Kōtetsu Ichigō, born February 18, 2961) and Metal #2 (鋼鉄2号, Kōtetsu Nigō, born August 28, 2967), respectively, debuting in 2997 (each year is 1000 years later than the actual date). Together, the Metal Brothers released two full length albums of covers of anime songs and two singles of original songs.