When world-famous Europol profiler Simon Hoxley (guest star Alan Cumming) shows up in New York and claims that Major Crimes’ current case is connected to the discovery of Endicott’s body overseas, Bright fears he and Ainsley’s secret is about to be exposed. Meanwhile, Martin gets to know Dr. Vivian Capshaw.

As the search intensifies for a serial killer on the run, so does Malcolm’s tenacity, causing U.S. Marshal Emily Ruiz (guest star April Hernandez-Castillo) to kick him off the case. However, Malcolm doesn’t back down that easily.

After a mysterious shooting leaves one of their own injured, Bill and the team go out on a mission to find the shooter.

When Joseph's childhood friend is wrongfully accused by the LAPD, he involves Bill in his mission to find the truth.

When informants for the Sheriff's Department start turning up dead all over Los Angeles, everyone has to work together to find the leak in the department, in the season finale.

Religious zealots in the path of a raging wildfire square off with the White House over their convictions. Wells digs for the truth behind a betrayal.

A hijacked plane hands Kirkman an international crisis. A White House advisor shakes things up. Wells tracks Lloyd across the globe with a new ally.

Mark is taken down in a Proleathean shoot-out and Sarah must step in to help. But as Sarah gathers intel that puts her on the trail of the original Castor DNA, a familiar foe is not far behind. While Helena continues to toil in a faraway military compound, it is ultimately Sarah's fate that will hang in the balance as she tries to save her sister. Meanwhile, Gracie is cast out from the Prolethean fold, and Alison and Donnie come face-to-face with unhappy drug lord, Jason Kellerman.

Klaus and Stefan arrive in Chicago, where Stefan is reunited with a vampire (recurring guest star Claire Holt (Pretty Little Liars, H20: Just Add Water), who hasn't really moved on from her interest in him decades earlier. In a flashback to Chicago in the 1920s, Stefan comes face to face with a shocking chapter from his wild past. After Damon gets a tip on Stefan and Klaus' whereabouts from an unexpected source, he and Elena follow their trail. Meanwhile, back in Mystic Falls, Tyler is concerned about Caroline and turns to Sheriff Forbes (recurring guest star Marguerite MacIntyre) for help.

The brutal attack on Cody unites friends and enemies alike, as Hap takes the opportunity to try to pull a rival into the fold. A vengeful Billy is determined to uncover the person responsible for the crime and, against his better judgment, finds himself looking to Wick for help. Meanwhile, Wick is at his wits' end when he learns of Gary's involvement and decides it's time to take matters in his own hands. And, Carla senses Hap is having an affair with Jules and she is not afraid to confront this head on.

LaShawn returns to the high school followed by a group of people, who present a grave threat to our kids at the school.

Clary, Jace and Simon venture to Seelie Court, only to face manipulation and mind games at the hands of the Seelie Queen.