Every hero has a dark side line used in a preview.
It is strange to see Sean bean on a tv show because all that I can recall seeing him in is goldeneye, national treasure, and movies.
He was in a great show a couple years back called "Missing". Even though it was a fantastic show the execs cut it after it's first season. They got a lot of backlash for that cancellation too but like most in the end it didn't bring it back.
It's one of the reasons you're starting to see good shows on the smaller networks like USA, TNT, FX, and AMC. The actors and writers are beginning to ditch the major networks.