Megazone 23 was initially conceived as the studio ARTMIC's next television project after Genesis Climber Mospeada with an unrelated story, but it was converted into an OVA after the sponsors withdrew during the production.
Megazone 23 was the second Original Video Animation (OVA) released in Japan (as stated by Matt Greenfield on the audio commentary track on the ADV Films DVD), and among the first to be a commercial success. The first OVA, Dallos, was released in 1983 but was considered a financial disappointment.
Since the first OVA was not initially intended to have a sequel, it lacks the Part I subtitle on it's initial release however was added on video covers of subsequent reissues after the release of Megazone Part II.
The original ADV Films DVD was available in both a stand alone DVD and a 'Collector's Edition' that included a cardboard box to store all three volumes of the OVA series, a mouse pad with EVE printed on it.