Nobody talks about this one. A kid and his robot get sucked into a black hole and have to outsmart a dictator using nothing but improvisation and the absurd logic of 80s adventure comedies. The pacing never stops to explain itself, the jokes land because they move too fast to overthink, and by the time you realize what you're watching is genuinely clever, it's already moved on to the next thing. It's the kind of movie that feels like it was made for people who actually liked adventure, not people who needed to be convinced adventure was serious. Made in 1988 when studios still took risks on weird one-offs that didn't need to be franchises. If you've spent years hunting for forgotten anime that actually deserve the hunt, this is exactly the kind of discovery you were looking for.
Ultra B: Black Hole kara no Dokusaisha BB!! is a 1988 adventure and comedy movie.