The hunt for a methodical killer takes the BAU to Arizona to search for an increasingly devolving unsub, and the team speculates that Hotch is in the running to be the new BAU Section Chief following the death of Erin Strauss.

D.B. Russell leads the CSI team on a hunt to find Morgan and Ellie Brass following their kidnapping by a ritualistic killer.

The gang does their best to recoup their investments in questionable schemes by dumping their losses on Ben the soldier while trying to avoid being duped again by whatever mastermind is pulling their strings.

The East/West bowl players make their own rap videos, a mobster is suspicious about a dinner party, and Metta World Peace ponders a difficult dilemma.

From "The Crazy Ones", actor Robin Williams; from "Masters of Sex", actress Lizzy Caplan; an opera Top Ten List presented by soprano Renée Fleming; musical guests Icona Pop.

The SVU squad searches for Detective Benson and her abductor.

When a young boy is abandoned, the squad discovers more victims waiting to be rescued.

Phil and Claire try to orchestrate a kid-free week during Luke, Haley and Alex’s summer activities; Cam and Mitch try to have a memorable summer.

Luke and Manny have their first day of high school; Claire returns to the workforce; Mitch juggles an important meeting and Lily’s first day of grade one.

After the crash, Rayna is in a coma and Deacon is left to wait on his pending jail sentence. Teddy is still shell-shocked about Peggy's pregnancy and struggles to understand where he belongs... Is it by Rayna's side with his daughters? Meanwhile, Maddie grapples with the revelation that Deacon is her father and, feeling alone, turns to Juliette, unwittingly revealing the details of what happened before the traumatic crash. And Gunnar and Scarlett's relationship becomes even more complicated after the proposal, so they turn to their friends, Will and Zoey, for support.

When Cartman manages to get himself behind the doors of the NSA, he doesn’t like what he finds in his personal file. He thinks it’s time he told everyone the truth. Meanwhile, Butters finds someone new to listen to his prayers.

Sonya uses Linder's latest problem to repair her relationship with Marco. Charlotte forms an unlikely alliance.

Google cracks down on YouTube, Fox News assesses the "war on football," Ted Cruz gives a 21-hour anti-Obamacare speech, and Joseph Gordon-Levitt describes his film, "Don Jon."

From WIGS' "Paloma" and "Blue", actress Julia Stiles; from "Full Circle", actress and singer Keke Palmer.

When their friend is murdered, Rafi and Dirty Randy head to L.A. to avenge his death and break into the mainstream porn business.

Against Axl's wishes, Frankie insists on having the entire Heck family along for the ride as they drive to his college to move him into his dorm. But the short drive turns into an eternity when Sue freaks out after discovering that Frankie forgot to fax in her essay to be a candidate for Junior Peer Leadership Advisor, and Brick proves once again that he can't be trusted when he keeps losing his new cell phone.