In formatting their New Adventures of Mighty Mouse and Heckle & Jeckle, Filmation found room to include a weekly serial as part of the show.
The Great Space Chase was a parody of Flash Gordon, whom Filmation had also acquired in 1979, ahead of the infamous feature film that appeared the following summer. In fact, actors Alan Oppenheimer and Diane Pershing worked on both Flash & Space Chase, which certainly helped.
Three years later, Filmation re-edited the serial into a feature film for theatres, but it failed and was reissued as a matinee-only entry. Sad to say, none of the chapters are available intact on YouTube, and there are no plans to release the serial on DVD anytime soon.
Here's the complete serial:
A noble effort that failed, that's all it really is.