Dave Comstock - 15/10/2018
There were three programmers on the project: Tan Duong (the original project lead), me, and Paul Donahue. I believe Tan left Atari towards the end of the project, so I took over as lead. When the movie tanked, the basic game was complete but we had still had character set slots and space left in the cart for adding more variety to the levels; as others have noted, the controls also needed tweaking. They did a focus group on what we had and it went OK, but with the handicap of the bad movie, the project was cancelled.
AbbotKinneyDude - 24/07/2017
Make that three: Dave Comstock & Paul Donaldson (Programmers), Brad Fuller (Audio). Source: http://www.atariprotos.com/8bit/software/supermanIII/supermanIII.htm
AbbotKinneyDude - 20/07/2017
Out of the three programmers, it seems Dave Comstock and Brad Fuller were involved. Source: https://www.youtube.com/watch?v=vBbiMHiQUKM
Superman III is outstanding. It's like Missile Command on steroids. The controls are a little tough to use, but once you get the hang of it, you'll have a good time. Too bad this didn't release back in the day, I think many people would've gotten a kick out of this.
I believe this game was never officially released since Atari (who also provided some of the computer graphic effects for the movie) was going through turmoil by this point. Despite the movie-in, you really don't get to do any cool Superman things, except awkwardly fly around and use your heat vision against your adversary. The game did not capture any sense of the magic and adventure of the Christopher Reeve films.
The original 2600 version of Superman was more fun and had greater playability than this attempt, which was rather poor even by Atari's standards. Mediocre sound, graphics, and gameplay really didn't help its cause.