97 years after a nuclear war, human kind is living in space. 100 juvenile delinquents are sent down to Earth to see if the planet is habitable.
While Oliver deals with the pressure of Slade's threats against Oliver and his loved ones, Amanda Waller with A.R.G.U.S. recruits Diggle for a black ops mission. Diggle is happy to learn that he'll be working with his ex-wife Lyla... but not so thrilled that three convicts will be going on the mission with them.
Morgan's visit with a survivor of unusual stabbings in upstate New York leads to more questions about the case.
On a solving streak, Jake decides to spend his weekend off with Sgt. Terry trying to crack a cold case that no one thinks can be solved.
Pierce's mental stability is questioned and his job threatened when he is accused of stalking his ex-girlfriend, Caroline Newsome. As the situation escalates, Moretti works to find the real stalker with help from a visiting inspector from Canada.
Jamie has been seeing Isabel for a few weeks and is enjoying having some carefree fun for once. Laura is hurt and shocked to discover he's in a new relationship and can't believe Jamie has been so easily manipulated. However, Jamie however doesn't see it that way and is happy to finally be in a relationship with a girl who is not blowing hot and cold all the time. Laura realises she may have finally lost him.While Danielle is in a dilemma about dating her tutor, Beth finds it hard to shake off a lesbian admirer, Poppy. Worried that she has led Poppy on and too PC to rebuff her directly, Beth consults Mike on the best way to alienate women - after all, he's an expert. Mike coaches Beth, Cyrano de Bergerac-style, on how to get dumped.
Sam and Dean are searching for the First Blade and end up having to track down the missing Crowley and discover that he's now thoroughly addicted to human blood. The Winchesters decide that going cold turkey is the only way.
Lt. Severide is reminded of his own past by a man he saves from a car accident and feels compelled to help him. Elsewhere, Lt. Casey and Chief Boden grapple with how to dock Jones per her father’s orders. Meanwhile, Mouch and Dawson have troubles with the opposite sex and an emotional call to duty creates ripples throughout Firehouse 51.
A senator's daughter is found murdered; Tommy begins to slip back into old habits; Jane reveals some shocking news.
Charlie's growing relationship with Jo concerns Danny; Lacey takes a liking to Whitney's wild side.
The Artists get up close and awkward with naked Canvases. The game is on when one Artist screws everyone over. New York Yankees Legend CC Sabathia is Guest Judge. Another Artist loses a shot at $100K.
Detective Inspector Jimmy Perez believes he and his team are finally closing in on the killer as they discover what 17-year-old Catherine Ross was hiding from everyone in the hours before her death.
Elijah is taking control of the quarter and receives a surprising offer, and they know how to throw a party.
Wedding planning continues as Kate will not be fazed by all the stress and chaos around her, which is only amplified by the arrival of her mother and Pete's parents. However, things come to a screeching halt when the family gets some bad news.
The guys build a chalet at the top of a ski slope for a father and son who enjoy winter sports.
Marcus asks Will for advice on how to get invited to a girl's birthday party.
Armond moves in with his taxidermist father; Bobby Bottleservice confronts a cheater; a shocking accident will change Wheels Ontario forever.
When a gang identifies and executes an undercover agent, the team must locate a mole before other agents are put in danger.