It has a very strange storyline. It seems that Teela and the Goddess are actually one and the same. According to Skeletor, Teela is a clone of the Goddess that Skeletor made 20 years ago. Skeletor turns Teela on her mother and they fight. The Goddess tries to fight without hurting Teela, then when she gets an opening she hugs her daughter and the two merge into one person! With their combined power they kick Skeletor out of the castle. Then they separate into two regular people again. Pretty strange, huh? By the way, if there's anything remotely designated as canon, this is not it.
1982, Series 2.
Packaged with Teela.
Scans courtesy of Mr Creozote of Goodolddays.org.
Used with permission