This Comic's Cast:

Remember, Medusa wasn't around for the whole recruitment drive. She doesn't know this isn't still the Villains guild.

As for why she shows up... eh. Why not? I hadn't used her in a while, and it just seemed fitting, since she doesn't show up in the main series comics around this time, either. Good way to work a villain into this storyline (aside from Thereshiri, who really doesn't count at this point).
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.