Masters of the Universe begins when the evil Skeletor finds a mysterious power called the Cosmic Key, he becomes nearly invincible.

However, courageous warrior He-Man locates inventor Gwildor, who created the Key and has another version of it.

During a battle, one of the Keys is transported to Earth, where it is found by teenagers Julie and Kevin.

Now both He-Man and Skeletor’s forces arrive on Earth searching for the potent weapon.