Galatea quickly turns into this in "Hercules and the Dream Date", beginning with her transforming into a monster and terrifying poor Helen into near incoherence by telling her that if she talks to Hercules again she'll rip out her vocal chords.
http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/HerculesTheAnimatedSeries
FollowingNightmare Fuel / Hercules: The Animated Series
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