I love that movie! When I was a kid, it was on Select TV (now THERE'S a blast from the past!). I watched it many times. Cool movie, and even cartoon nudity was a big deal for my adolescent sensibilities.
To tell you how OLD I am I saw Heavy Metal...at the drive-in theater.
With my dad.
Can't beat that soundtrack.
And all of the SCTV voices.
John Candy, Harold Ramis, Joe Flaherty, etc.