The Quantico episode “Over” is set in the future. The FBI computer system has been hacked and confidential information has been leaked and made public. While looking through the hacked files Alex (Priyanka Chopra) concludes that someone out there is making and planting a second bomb in the city — one bigger, more powerful than the one that went off in Grand Central Station. The one that FBI Deputy Director Clayton believes Alex denotated.
Clayton is portrayed by Mark Pellegrino. He’s best known for his roles on The Returned (Jack Winship), The Tomorrow People (Dr. Jedikiah Price), Being Human (Bishop), Supernatural (Lucifer), The Closer (Gavin Q. Baker III), Lost (Jacob), Dexter (Paul Bennett), and NYPD Blue (Steve Dansick). Pellegrino has also appeared in the films The Big Lebowski, The National Treasure, The Number 23, and Mulholland Drive, among others. Quantico airs Sundays at 10pm on ABC.