Macallan will play Special Agent Ava Sharpe, a hard working agent for a secret branch of the Federal Government (the Time Bureau) dedicated to the regulation of time-travel and the protection of history. She is very smart and incredibly ambitious and always believes she is the smartest person in the room. She is often quite ruthless in obtaining her goals and her drive for perfection has left many discarded friendships (and relationships) in her wake.
Source:
More at Deadline