Actually there is no sequel as such because Shogun Assassin is a
compilation of mixed up scenes from the Lone Wolf and Cub series.
This series is made up of 6 movies titled...Lone Wolf and Cub:Sword
of Vengeance 1972/Lone Wolf and Cub: Baby Cart at the River Styx
1972/ Lone Wolf and Cub: Baby Cart to Hades 1972/ Lone Wolf and
Cub: Baby Cart in Peril 1972/ Lone Wolf and Cub: Baby Cart in the
Land of Demons 1973/ White Heaven in Hell 1974. Shogun Assassin was
made in 1980 for the US market and this was the last in the
series.