Animated apocalyptic sci-fi movie from the 70's or early 80's [closed]

Every few years I make an attempt to find information about this barely-remembered show that I saw. I was probably around 6 years old, and lived in South Africa at the time, for what that helps.

There were two protagonists, one of whom was a scientist or technologist of some format. They were discussing how to save the (city / world? ) from a black, formless orb which had appeared in their city. The views they showed of this orb against the city backdrop were all pink / purple, so dawn / evening / apocalyptic colour scheme. At one point, a laser (if I recall) is fired at the orb, which absorbs the attack and grows in size (much like the evil planet does in 5th Element). The impression I remember is that this was one of the last things they could try, and that they were growing desperate.

I believe it was in english, and is probably from the same era as Harmony Gold's english dubs of Robotech. That said, with the state of South Africa's TV networks and our international isolation at the time I have no idea whether my impressions are accurate.

I'm Curious if anyone has any idea what this movie or series might have been.