The title character in this episode is Echidna (Bridget Hoffman), who swears vengeance against Hercules (Kevin Sorbo), the man responsible for slaying many of her progeny. Echidna hatches an evil scheme to destroy both Hercules and his mortal mother, Alcmene (Liddy Holloway), using Alcmene's present suitor Demetrius (Martin Kove) as her agent of destruction. The climax finds Hercules deep inside the cave of Echidna, battling several malevolent forces to save both Alcmene and himself. ~ Hal Erickson, Rovi