So recently with my crew I decided to spice things up by creating a rival RT with his band of misfits. Acting as a kind of "Nega-Crew," I made them in hopes to create a bit of discord and competition. After introducing the cast to their new sworn enemies, I recieved a lot of eagarness with potential interactions and fights.
I suppose I wish to ask: What have other GMs who have created a Nemesis Crew done to use them effectively? I'm planning on having them collide every so often and duke it out with no clear winner until a final confrontation. What would you say worked or didn't work well with your villains?