Shogun Assassin is a 1980 jidaigeki film directed by Robert Houston. It was edited and compiled from the first two films in the Lone Wolf and Cub series, using 12 minutes of the first film, Lone Wolf and Cub: Sword of Vengeance (Kozure Ōkami: Kowokashi Udekashi Tsukamatsuru or Wolf with Child in Tow: Child and Expertise for Rent), and most of Lone Wolf and Cub: Baby Cart at the River Styx (Kozure Ōkami: Sanzu no Kawa no Ubaguruma or Wolf with Child in Tow: Perambulator of the River of Sanzu), both released in 1972 and based on the long-running 1970s manga series Lone Wolf and Cub created by the writer Kazuo Koike and the artist Goseki Kojima.