From Season 2 of Filmation's He-Man & The Masters of The Universe:
Evil-Lyn is after the riches of an ancient city, whose citizens are in a petrified state of suspended animation. She tricks King Vokan into attacking Castle Grayskull, but you know that's not going to work.....! Here's "Journey to Stone City", written by J. Michael Straczynski:
Unfortunately, the closing credits were edited off. Predictable fare.