Find out more about the Hellions' connection to the Outcasts by finding a Helion who will talk
I have grave concerns with what the Hellions are up to. They seem to be consorting with the Outcasts on a more regular basis. Perhaps you should go 'talk' to some of the weaker Hellions and see if they can give anything up on their connection to the Outcasts.
If I were you I'd start in Galaxy City or Perez Park. Most likely they won't roll over on the Outcasts easily.
Defeat X Hellions
Mission Complete: The last Hellion you defeated told you everything he knew about the connection.
The defeated Helion told you that the Outcasts were interested in buying whatever artifacts the Hellions could come up with, and would give some of the more powerful Hellions relics they could use to manifest powers. This Hellion thought that there was a gang even higher up the chain from the Outcasts who were really pulling the strings though.
Good job, Red Tomax. I'd be interested in finding out who the Outcasts are reporting to as well, but that will have to wait for another day I think.