Gall Force 3: Stardust War (1988)
Gee whiz, there was no need for that to be an hour long. It's watchable enough, but roughly three quarters of the film is made up of talking heads and what they're saying isn't that desperately interesting by this stage; there's no real character development and the potentially interesting speculation on mutually assured destruction isn't enough to carry the film on its own. Stardust War does come alive in its final reel and provides a decent conclusion to the initial Gall Force trilogy, but it's painfully obvious that there were roughly 30 minutes of content here that should have formed one film along with Destruction.
Not having previously paid too much attention to the release dates though, it did surprise me a little that the upcoming Rhea Gall Force was teased in the end card.