Project Blue Earth SOS (Japanese: ProjectBLUE 地球SOS, Hepburn: Purojekuto Burū Chikyū Esuōesu) is an anime series consisting of six hour-long (with commercials) episodes.

The entire series takes place in a version of the nineties redone into Retro-futurism, being behind in current technologies, and far ahead in others.

On January 1, 1995, a G-Reactive fighter plane was being tested, while it was hit by a mysterious rainbow light and disappeared.

Fortunately, scientists developed the Sky Knight, a fighter plane capable of defending the world.

In a review for the first DVD volume, Anime News Network's Carl Kimlinger had called the show as a "throw back to the gee-wiz adventures of 50's B-cinema and the likes of Tom Swift".