Evil-Lyn is a deadly witch from Eternia. Her origins are mostly unknown, but she has managed to forge an alliance with Skeletor soon after his arrival. She is greatly powerful, and apparently, immune to aging. It is rumored she is more than 500 years-old. She is Skeletor's right arm, and represents him in many occasions, even though he does not trust her.

In the original version, the "Evil Goddess" was yellow skinned, and had basically the same role as in "Grayskull". The action figure was released in 1982, and she was often present in the cartoon series and was also included in the action movie.