Played by: Katey Sagal

Always guided by the need to protect her family, but Gemma Teller Morrow’s actions are incredibly malicious. She’s a master manipulator and does everything in her power to get to the top. Nothing exhibits this mindset more than when she, along with Clay Morrow (Ron Perlman), murdered her first husband and covered it up. This allowed the two to marry and run the Sons of Anarchy however they wanted.

These are the types of actions that land her on this list, and the character succeeds due to the fierce performance by Katey Sagal. She can flip the switch from affable to psychotic so quickly that it makes everything about Gemma that much more dangerous.