A nameless ronin, or samurai with no master, enters a small village in feudal Japan where two rival businessmen are struggling for control of the local gambling trade. Taking the name Sanjuro Kuwabatake, the ronin convinces both silk merchant Tazaemon and sake merchant Tokuemon to hire him as a personal bodyguard, then artfully sets in motion a full-scale gang war between the two ambitious and unscrupulous men.
In this loose adaptation of "Hamlet," illegitimate son Kôichi Nishi climbs to a high position within a Japanese corporation and marries the crippled daughter of company vice president Iwabuchi. At the reception, the wedding cake is a replica of their corporate headquarters, but an aspect of the design reminds the party of the hushed-up death of Nishi's father. It is then that Nishi unleashes his plan to avenge his father's death.
Nuclear tests create a radioactive man who can turn people into slime.
