Supergirl , The Flash , Green Arrow and Superman engage in the battle of their lives.
When an illegal arms broker turned informant is assassinated, OA assumes his identity and goes undercover to stop the sale of dangerous weapons, with help from Maggie and their former FBI instructor, Rowan Quinn.
Officer Nolan and Officer Bishop respond to a silent alarm call at a local convenience store where two men are attempting to rob the place. Officer Nolan pursues one of the suspects on foot and is forced to make a split-second decision that will affect both of their lives. Meanwhile, Officer Bishop helps coordinate a drug bust that hits a little too close to home for Officer Bradford.
A new threat challenges ship protocol; Mel notices changes in the crew; Lommie returns to Greywing.
On the road and running out of places to stay, Jughead and Archie head to Toledo to visit Jughead's mother Gladys and sister Jellybean. Back in Riverdale, Betty inches closer to uncovering the truth about Griffins & Gargoyles, while Veronica and Cheryl take on Hiram, Hermoine and Penelope after more students fall victim to seizures.
Hayley wants to give the family a Christmas gift they will never forget if she can just figure out the perfect time. Meanwhile, Claire is mad that Phil has once again borrowed the family Christmas tree for a house-showing; and Jay, Gloria and Joe have to deal with some unwelcome visitors over the holidays.
The hunt for Andres Doza comes to a head when the SEAL Team makes one last ditch effort to find and capture the leader of one of the most powerful and lethal drug cartels in Mexico.
Heahmund must try to convince King Alfred that his actions are in defense of the Crown. Ubbe and Torvi strengthen the position of the Vikings but not all in the Viking camp support their strategy. Another settler disappears in Iceland.
D'Branin pushes ahead with his plan; Rowan processes his grief; Agatha finds a way to help.
Prentiss faces her past when the BAU is sent to investigate the murders of prominent businessmen, all of whom are missing their hearts. Also, Prentiss plans a romantic first date with Mendoza, but the evening is cut short by an urgent call from Rossi.
Sam and Dean enlist the help of their pal Garth to gain inside information on what Michael may be planning. The brothers split up to each go after weapons that can aid in their fight against the Archangel, but this may be a fight our heroes cannot win.
As Hope hit the books to learn more about the latest creature to arrive to the school, things take a dark and twisted turn leaving her to confront one of her darkest fears. Meanwhile, Alaric attempts to help Rafael cope after his past comes back to haunt him.
Christy's search for the perfect Secret Santa gift leads her to discover Adam has been hiding something from Bonnie. Also, Tammy looks for a job in order to avoid being sent back to prison.
New orders leave the Nightflyer and its passengers hanging in the balance.
A woman asks her slightly-younger self to recreate the events of one night at a college frat party.
In the wake of tragedy, Manfred vows revenge. Joe squares off against a former ally to save his husband. Fiji spends a night on the town. Kai gives Patience an ultimatum.
Mike finds getting Ed a special Christmas present is easier said than done..for the man who has everything. Meanwhile, Eve returns to visit and Vanessa helps the family realize the importance of their long-standing holiday family traditions.
With some help from an outpost of renegade hackers, Warren and George hack Altura's defenses and discover Estes' secret plan.
In his hometown, Axel fights both his tragic past and a vicious pack of Daywalkers; Sam can't find Mohamad and takes his anger out on Chad and Mike.
A charismatic pool shark tries to convince his reluctant cousin to stay in the hustling game.
Lukrum pushes its corporate interest too far and unintentionally jeopardizes the safety of both colonies. IMSF springs into action to stabilize the situation, but for some, it will be too late. In the current climate on Earth, human activity has destabilized the natural world. NASA's Operation Icebridge studies Arctic sea ice in an attempt to bring awareness to global warming and the dramatically changing state of our planet, the only home we have… for now!
On the day of the escape, Matt and Sweat know the smallest mistake can derail their whole plan. But when a stern corrections officer takes over the post in the tailor shop and fellow inmate Murder gets out of the Special Housing Unit, Matt seems attracted to the danger. Tilly and Lyle have a fateful dinner at an all-you-can-eat Chinese restaurant.