Sandayu Dokumamushi ( (毒蝮 三太夫 Dokumamushi Sandayū?) born Iyoshi Ishii (石井 伊吉 Ishii Iyoshi?) on 31 March 1936 in Osaka, Japan) is a Japanese actor. He portrayed Daisuke Arashi in the original Ultraman (1966-1967) and Shigeru Furuhashi in Ultraseven (1967-1968). He has been a radio personality on the Tokyo Broadcasting System (TBS) from October 6, 1969 to the present. His radio program is famous for vulgar language and is popular with an older audience. He is nicknamed Mom-chan (まむちゃん Mamu-chan?), Viper (まむし Mamushi?), Mr. Viper ( まむしさんMamushi-san?).
- Shigeru Furuhashi (Ultraseven, main role)
- Captain Furuhashi (Heisei Ultra Seven - Solar Energy Strategy, The Ground of the Earthlings)