The universe is growing dark and on Earth it is eternal winter all because a selfish princess is trying to keep the diamond like planet Spectra to herself. Rainbow Brite, a girl in charge of changing the seasons and keeping the universe colorful, steps up to stop the princess. All of her friends help, including a brash, overconfident new aquaintance called Krys. If Rainbow does not free Spectra (and if she and Krys don't stop arguing) everything will turn gray and die.
This trailer came from a 1986 Warner Home Video preview tape.
This TV spot was originally posted to YouTube by seanmc31076.