I loved The Mighty Orbots show when it was broadcast decades ago. It lasted only one season and ended with a finale episode, which is unusual for cartoons. Was it always planned as a one-season show? It doesn't appear to have ever been released on DVD - why did it just disappear?
According to Wikipedia, the 13-episode series was never released on DVD. It ended early
This may have affected its release.
According to a rather informative review here, poor ratings were its downfall, though its release in other markets on VHS developed a small cult following. T M S Entertainment, Inc./M G M/U A Entertainment Company is the copyright holder according to US Copyright office. If you have access to a VCR, there are a couple of libraries in the US that apparently have it in their collections (set of 13 tapes). You might be able to get your local library to do an inter-library loan for you.