Shannyn Sossamon will appear as Pandora, a mysterious new character, in the upcoming third season of "Sleepy Hollow" as a series regular.

According to TV Line, Pandora is "a mysterious new presence in Sleepy Hollow who seeks assistance from Witnesses Ichabod and Abbie." Sossamon's past credits include "Wayward Pines," "Mistresses," "Moonlight" and "How to Make it in America." She joins a growing cast, including new addition Nikki Reed (Betsy Ross).

The series stars Tom Mison as Ichabod Crane, a soldier and spy for George Washington who’s resurrected in modern times, where he teams with a police lieutenant (Nicole Beharie) to save Sleepy Hollow, and the world, from supernatural forces. Season 2 ended last month with Crane making the decision to kill his wife Katrina (Katia Winter) to ensure a decisive victory over evil.

“Sleepy Hollow” returns to Fox on October 1 at 9 pm EST.