S1·E13 The Proud Mermaim
Aired October 7, 1972
Synopsis
Xenon dispatches Demon Mermaim to assist Xannin in his fight against Devilman. She does not care for Xannin, and puts a spell on him to prevent his interference. Mermaim moves in and attacks the Makimura family while they are on vacation. As Devilman does battle with Mermaim, Xannin discovers Miki.