When Lindsay is tipped off about a grieving father looking to avenge his daughter's death, Olinsky goes undercover as a hitman-for-hire. With Gang Intelligence lacking enough evidence to arrest the original gangbanger in question, the team works to reinvestigate the case. Meanwhile, Ruzek comes back after finishing his undercover assignment only to have Voight knock him down to patrol duty.

When a Supe kills the love of his life, A/V salesman Hughie Campbell teams up with Billy Butcher, a vigilante hell-bent on punishing corrupt Supes — and Hughie’s life will never be the same again.

Sam enlists everyone’s help in trying to track down Dean, who can literally be anywhere. Meanwhile, Castiel may be in over his head after meeting up with an unreliable source. After being drained of his grace, Jack is adjusting to life as a human, learning new skills and figuring out how he fits in to this world of hunters.

When a charred body is found in a torched house, Intelligence must work to identify the victim, as well as a young boy who is found badly injured inside. As they look to determine the cause and who may have been involved, they are faced with a web of secrets and lies. Meanwhile, Lindsay and Halstead receive an odd warning about Rixton that leaves them suspicious.

The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates a humble planet caught in the middle - Organia, inhabited by pacifists

Dr. Rhodes convinces Dr. Latham to join him for a medical trip out of town. Dr. Manning treats an 8 year-old cancer patient who wants to give up on his battle. Elsewhere, an unhealthy woman with heart problems is brought in and doesn't want to listen to doctors. Meanwhile, Dr. Choi, Dr. Charles and Dr. Reese work on a complicated case involving a woman with a personality disorder.

Our heroes, Sam and Dean Winchester, continue to be tested in the battle between good and evil, but one impulsive decision could alter the lives of one the brothers forever.

Ben lands in 1979 Chicago as Jack Armstrong, a devoted security guard to talented pop singer Carly Farmer. During Carly’s prep for a concert, it quickly becomes clear her life is in danger and Ben must determine who is trying to kill her and why.

The body of a 15-year-old girl is found crushed in an abandoned building after she runs away from a treatment center for troubled girls. Voight sends Halstead undercover as a guard to work from the inside at the center, where he believes the girls are trading sexual favors for something in return.