Santo Contra Blue Demon En La Atlantida (1970)

aka: Santo vs. Blue Demon In Atlantis

A mysterious power broadcasting from the hidden ruins of lost Atlantis is threatening the world with an atomic attack from space. The authorities have connected this new foe, Achilles, with a WWII Nazi scientist who had worked on the theories of perfecting a master race. Santo works with Blue Demon and a scientist to nullify their plans. (In Spanish language).