Invaders From Space (1965)

aka's: Sûpâ jaiantsu – Kaiseijin no majô/Super Giant 3

Aliens from the planet Emerald send superhero Starman (Ken Utsui), their cosmic crusader in bulging tights, to stop amphibious invaders from space in this flashy, martial-arts, sci-fi adventure. Also stars Sachihiro Ohsawa.

Note: In the original serial, the aliens are described as being the kappa, a creature from Japanese mythology. But in the condensed U.S. version, the aliens are instead referred to as “salamander men.”