What was the name of that robot that Supergirl fought that had no legs and fired missles from his chest?
You're thinking of Matrix-Prime, who first showed up in DARING NEW ADVENTURES OF SUPERGIRL #6 (1983). He didn't have legs, but he had these sort of tubes that were leg-jets. And yeah, he was a pretty awesome obscure villain.
Last time we saw him, Brains from the Gang had placed his brains in the body of Matrix-Prime. Intriguingly, Ms. Mesmer from the Gang, and the hypnotic disc on her chest, was recently used as a part of the all-female villain army that was assembled by Circe.
By the way, those weren't missiles that Matrix-Prime fired from his chest. Those were
other robots.