EXCLUSIVE: Alanna Masterson is joining the cast of AMC’s smash The Walking Dead. She will recur in the upcoming fourth season with an option to become a regular in Season 5 of the zombie drama. Details on her role are scarce but she will be introduced in the middle of the season as a new survivor in the world of the walking dead. There is chatter that the character might be Tara Chalmers from the comic books but the network is keeping mum. Masterson, repped by Jackie Lewis at LBTalent and manager Carol Masterson, joins another major new addition to The Walking Dead, Christian Serratos.