Defenders of the Earth Movie: The Necklace of Oros
The necklace of Oros would give Ming his long-awaited wish of knowing the secret of gravity. Knowing that it is Jedda's birthday and, on that day, she gets to select a gift from the family jewels Ming arranges through Gravitron that she select the necklace. Thus begins another splendid episode in which the forces of good and evil are colorfully depicted through luxurious landscapes and terrifying aliens.
Starring
Watch "Defenders of the Earth Movie: The Necklace of Oros" on Tubi TV released in 1987. It's a animation and action & adventure movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.