Jim Henson's The Storyteller 1x9

A girl who was adopted by an abusive troll finally is freed with the help of a white lion. When her betrothed does not return after a trip, the girl is grief-stricken to learn that the troll's sister had put a spell on him and plans to marry him. The white lion appears again and helps the girl by giving her three magical gifts. From an early German folk tale.