Halloween chaos takes over the E.D. Hannah helps a pregnant woman with an autistic son.
The unit learns the truth about a secret Torres has been keeping, as Deputy Chief Charlie Reid puts a focus on Intelligence.
SAMCRO deals with the fallout from a death threat made against Tara.
While Team Scorpion works to stop an influx of drugs being smuggled into the country via drones, Walter gives Happy and Toby an ultimatum on their new relationship. Penn Jillette returns as Toby and Walter's couples counselor.
