Mary / Gamma

Mary, formerly known as "Gamma", is a former antagonist and a survivor of the outbreak in AMC's The Walking Dead. She is the sister of Frances and the aunt of Adam Sutton. After saving Alpha's life to prove her loyalty, Mary becomes the third-in-command of the Whisperers.

When Mary discovers Alpha lied to the group about Lydia's death and guilty for having killed her own sister in Alpha's name, she becomes disillusioned and regretful of her devotion to the Whisperers and allies with the Coalition for a better life and to reunite with her nephew.