She just joined the cast of AMC’s The Walking Dead, a character name Sasha, and now actress Sonequa Martin-Green has also joined the cast of ABC’s fantasy hit series, Once Upon a Time, playing a character named Tamara.

The chracter is described as a mysterious, charming woman who’s secretly highly ambitious and a fearless leader driven to get what she wants.

Martin-Green's Tamara is expected to be a recurring character this season, and might appear in the show’s third season as well.

Martin-Green previously appeared on CBS’ The Good Wife and NYC-22. 

All new episodes of ABC's Once Upon A Time begin this Sunday at 8/7c.