The Acid-Ball.
The Acid Space-Ball, or Acid-Ball for short, was a normal Space-Ball, serving aboard the Exon, until he was forced to consume an Acid Pills by Liit. Since then, he has become a horribly acidic creature, positively exploding with acid.
He is assisted by the Toxic Space-Ball, who wears a special protective suit so he can survive the acid. (Space-Balls Series: "Space-Balls")