There's an episode of a space TV cartoon series that I saw when I was very young – this must have been in the eighties. I remember only one scene, which somehow left a strong imprint in my mind lasting through decades. I've tried searching but I have very little to go on. I hope my very short description may ring a bell with somebody.
The scene featured a mine field of sorts, but instead of explosives, it consisted of skull-shaped stationary objects that launched rockets from their mouths.
This particular scene ended with this mine field in the foreground, and the protagonists' space ship(s) retreating in the background.