Heroes aren't always out there in flashy outfits getting their picture taken while helping people out of a burning building. Sometimes they have to rely on subterfuge, spying, and dirty tactics to help serve the greater good.
With Uncanny X-Force currently being better than ever and a new team of Secret Avengers coming soon, we wanted to take a look back at Marvel's best secret teams -- just don't tell anyone, or we might have to kill you.
Check it out at IGN!
