Lincoln James Potter (alias Nick Stackhouse and Gabe Marcel) is the Assistant U.S. Attorney investigating the Sons of Anarchy Motorcycle Club. He is ruthless and determined, willing to cross legal boundaries to get a job done. Although he can be viewed as the main antagonist of Season 4 overall, he also performs acts that are beneficial to both the Sons and Charming, and thus he can also be viewed as an anti-hero of sorts.