Photo Flash: CASTLE's 'The Human Factor,' Airing 5/6

On CASTLE's upcoming episode, titled "The Human Factor," when Homeland Security inexplicably seals the crime scene of a car bombing, Castle and Beckett find themselves with two mysteries on their hands: who murdered the victim, a government whistleblower, and why are federal agents trying to take over the case? The plot thickens when they discover that the victim wasn't killed by a car bomb but by a missile from a military drone, on MONDAY, MAY 6 (10:01-11:00 p.m., ET) on ABC. Carlos Bernard guest stars as Jared Stack, a mysterious operative who may hold the key to solving the case.

Check out a first look below!

Photos by: ABC/Richard Foreman

Nathan Fillion

Nathan Fillion, Jon Huertas, Seamus Dever, Stana Katic

CARLOS BERNARD, Stana Katic

Nathan Fillion, Stana Katic

Nathan Fillion, Stana Katic

Stana Katic, TAMALA JONES

Stana Katic, TAMALA JONES