Svengoolie
The War of the Gargantuas (1966)
A giant, cannibalistic humanoid's rampage through Tokyo is halted by his more docile twin, but neither their reunion nor their scientist caretakers can prevent their eventual duel.
A giant, cannibalistic humanoid's rampage through Tokyo is halted by his more docile twin, but neither their reunion nor their scientist caretakers can prevent their eventual duel.