she didn't fully comprehend her Alpha ability. Despite her carefree nature, Nina has shown a more sincere, caring side like when she offered Rachel a place to stay after being moving out of her parents’ house. A running gag is that Nina always has a different car that she "Borrows", implying that she pushes others to lend their keys to her. In the episode "When Push Comes To Shove", it is revealed Nina first used her ability on her father who wanted to leave, but she pushed him to stay; it was later shown that her father had been unable to leave for work because '... he couldn't leave' and required her to push him again to allow him to go to work. However, despite Nina's attempts to make her father stay, the stress of wanting to leave but never being allowed to by Nina caused her father to commit suicide. Her ability appears to be getting stronger with continual use; originally she could push for a few minutes, but can now make it last for over half a day. She takes a break from the team in season two, her abilities taking hold so she is soon pushing people regularly, including making an old boyfriend believe he's in love with her again. She tries to kill herself but is stopped by Hicks. Despite what she's done, Rosen chooses to bring her back to the team and continues to try to help her. Bill Harken (Malik Yoba) – A former FBI agent with the ability to activate his endocrinal 'fight or flight' response at will, resulting in increased durability and superstrength. He is also able to increase his running speed using this same manner, running nearly as fast as an escaping vehicle, and almost as fast as an Alpha running at ten times the normal human level. Extended periods of time in this heightened state (approx. 5 minutes) results in excessive strain on his heart which could lead to a heart attack. Due to the nature of his Alpha ability, Harken proves resistant to the influence of chemical manipulations in the brain (e.g. showing resistance to the pheromone–induced aggression). Kat (Erin Way) – A mysterious, free-spirited young loner whose Alpha ability allows her procedural memories to pick up any skill at a glance. The downside to her condition, which has plagued her entire life, is that her declarative memories are