The New Adventures of Superman

Lava Men (1x27)

Air date: Dec 10, 1966

When Superman tries to save a Mexican town from a volcano, he disrupts the lava flow and discovers that the lava can transform into a dangerous Lava Man. When he tries to destroy the Lava Man, multiple lava men rise up out of the broken pieces. Superman, however, manages to stop the lava men by cooling them off with water.