Rainbow Brite and the Star Stealer

Rainbow Brite and the Star Stealer is a 1985 American animated fantasy film directed by Bernard Deyriès and Kimio Yabuki. The film was produced by DIC Enterprises, Inc. and Hallmark Cards, and was released in the United States on November 15, 1985, by Warner Bros. It is the only film to feature the greeting card character Rainbow Brite; she also appeared in a few television specials prior to its release, and later in a Kideo TV series. In the film, Rainbow Brite tries to bring spring to an Earth that is already facing a perpetual winter. She must stop a wicked princess who wants all of Spectra, a planet-sized diamond through which all the light in the universe must pass.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.