Akio Ōtsuka
is the main antagonist of the first two Metal Gear games and the protagonist of the prequel series. He is the genetic father of Solid Snake, Liquid Snake and Solidus Snake. The character's past is explored in ' under the codename as a member of FOX special forces. After defeating his legendary war hero mentor, Snake establishes FOXHOUND in ' and Militaires Sans Frontières in ', and serves as Venom Snake's mental template in '. Naked Snake is voiced by Akio Ōtsuka in the Japanese version. In the English translation, Naked Snake is voiced by David Hayter (for the "Metal Gear Solid" prequels) and by Kiefer Sutherland (in "Metal Gear Solid V"). Big Boss is voiced by Chikao Ōtsuka (Akio Ōtsuka's real-life father) in Japanese and by Richard Doyle in English.