Cool and fun PG-rated animated sci-fi fantasy epic from Ralph Bakshi with Mark Hamil in a early role before “Star Wars”.
I recall seeing this movie back in 1977(OK, I am old) with the director presiding at a special screening at the University of Maryland. I have always enjoyed this movie, especially the dispatching of the chief villian 
MGP
It was a cool movie. Funny to watch it these days.. missed a whole lot watching it as a kid. Animation wasn’t worlds greatest, but so what.. had a good story and good characters.