Destroy All Planets (1968)

Earth is under attack from aliens wearing berets, like French mimes. Okay, so we're being invaded by a bunch of cheese-eating street performers, except these ones don't surrender so easily, who fly around in a spaceship that looks like giant bees in a scrum. Luckily for Earth, there exists a giant flying fire-breathing turtle named Gamera, who also hates performance art. Poor thing, he must get quite dizzy from all that spinning around, but doesn’t seem to affect him more than the freezing vacuum of space. And if you're wondering how he produces all that methane, he has four stomachs...