I am suddenly reminded that Megazone 23 is an OAV rather than movie series. Long enough (80 minutes for part I) to be treated AS movies should I so choose, but without anything resembling a worthwhile ending to Part I.
In fact the ending is downright frustrating so I'll probably skip it. However it also turns out that the best part of Someday's Dreamers
(the ending music) is available on iTunes, so that balances out.