After the shocking revelation that Zoom is Jay Garrick, Barry is more determined than ever to get back to Earth-2 to stop Zoom forever. Desperate to find a way to increase his speed, Barry decides to travel back in time and masquerade as his earlier self in order to get his arch-nemesis, Dr. Harrison Wells/Eobard Thawne, to teach him how to run faster. However, things don't go as planned and Barry is stunned to face familiar foe Hartley Rathaway, as well as old friend Eddie Thawne. Iris makes peace with her past in order to embrace her future.

There's no question that Louis and Jessica make a great team. They each do their part to make sure everything runs smoothly at home, at the restaurant and the investment property. But when Eddie comes home with lice and infects others in the family, Louis leaves it to Jessica to clean up the mess. Meanwhile, Eddie tries to back out of a bet he made with his teacher, and his classmates suffer the consequences.

Jess applies for a job at a progressive new school, but things take a turn when she finds out the principal is dating her ex-boyfriend, Sam. Meanwhile, Nick gets a cold and Schmidt quarantines the roommates to prevent himself from getting sick before his big presentation.

The knockout rounds continue with coaches Christina Aguilera, Adam Levine, Blake Shelton and Pharrell Williams' strongest team members remaining from the battle rounds.

When Pat plans a camping trip to enjoy some father-and-son bonding time with Jimmy, Kenny also joins them to prove that even though he's gay he can still be manly. During the camping trip, Pat continuously pressures Jimmy about his upcoming wrestling match, which leads to a surprising result.
Meanwhile, after Eileen discovers Shannon has been skipping her classes and refuses confirmation, she invites Father Phil over to help answer Shannon's challenging questions she has about Catholicism.

Rosa enlists Jake to help change Terry's disapproving opinion about her fast-moving relationship with Adrian Pimento. But their love for each other is put on hold when Pimento thinks someone from his past is trying to kill him.

Mack hopes for some downtime with his brother Ruben, but his plans are interrupted when a militia group calling themselves the Watchdogs prepares to wipe out the Inhumans... and a ATCU facility is their first target.

Johnny and Moira go out for their anniversary and run into a couple they knew from their former life, while Alexis and David attend Mutt's annual barn party, making up with some friends, and making out with others.

Liv consumes the brain of a recently murdered stripper and uncovers some extremely useful information. Meanwhile, Blaine isn't quite himself lately, and Ravi makes a startling discovery. Lastly, Major and Ravi are helping Peyton move back in with Liv when she receives a surprising phone call.

Nurse Lockwood gets arrested for refusing to violate hospital policy and draw blood from a suspected DUI patient without his consent. Dr. Halstead discusses with his lawyer the severity of the pending lawsuit against him. Elsewhere, Dr. Manning and Sharon Goodwin deal with a single mother and her 6-month old, but when the baby's injuries come into question, concerns are raised. Meanwhile, Dr. Charles, who is dealing with some personal issues, and Sarah Reese, attend to a patient that was hit by a car, but suspicions abound when they dig deeper.

Paint the town with Danny and his crew and revisit some of the most impressive paint jobs in Counting Cars history: a 1971 Road Runner gets a crazy new coat to commemorate a loved one, Rob Zombie's truck undergoes a screaming transformation, a Harley is transformed into a work of art inspired by the client's own tattoos, a dune buggy gets a nautical-themed electric blue makeover, a horse trailer is given a traffic-stopping new look, and a champion soap box racer receives a red hot finish that's bound to intimidate the competition.

The Institute is in full swing as everyone is preparing for the wedding of Alec and Lydia. Lydia is getting final touches made on her wedding dress, the wedding decorations are set and Isabelle is trying to figure out a way to throw a traditional, mundane bachelor party for her brother - whether he likes it or not. During what should be a time of great celebration for many is far from it as they examine their relationships. Alec is struggling on two sides - his wedding is one of the biggest days in his life and his parabatai should be at his side, yet he and Jace are still at odds. Alec also continues to struggle with his feelings for Magnus, especially when Magnus won't give up on Alec. And as the Institute is buzzing with romance, Clary is desperate to work things out with Jace, but he is keeping her at arm's length.
Meanwhile, Jace, Clary and Magnus go looking for warlock Ragnor Fell to try and find the antidote to awaken Jocelyn.

Nuptials on Shay Mountain turn deadly.

As Jack, Emma, and Izzy try to put the mother of all weird days behind them, Emma reveals a secret, Izzy finds committing to safe-bet Andy tougher than she thought, and Jack can't shake the feeling that he's gotten them all in over their heads.

An adrenaline packed new season brings a new face, 23 year old Sean Dwyer, who is fighting for the legacy of his father he lost too soon. The Time Bandit squares off with the law, Captain Keith's life spirals and Sig torments his former protege.

When he attempts to reign in a bratty student, Gerry is faced with the wrath of his notoriously overprotective and obnoxious mother. Upon realizing that she has fallen into the role of staff "punching bag", Bobbi attempts to transfer the title onto another staff member. Meanwhile, Ricki sells pencils to Robert and drives a hard bargain.

The artists use plenty of color during a contortionist body painting Flash Challenge; a veteran artist returns and adds a new-school twist to an old subject.

The team find themselves up against a deadly hacker who has already killed once... and isn't adverse to killing the Stitcher members if they get in her way.

Johnnie Cochran and F. Lee Bailey head across the country to get their hands on the Mark Fuhrman tapes. Judge Ito must decide whether the tapes, and the racial epithets they contain, are admissible.

Four bladesmiths face the unpredictable challenge of taking high carbon steel and wrought iron and forging these two conflicting materials into a fully functional weapon. After a formidable round of testing, only two will move on to the final round where they'll have just five days to create one of the most beautifully designed blades in history, the Ethiopian Shotel. Will this uniquely shaped blade throw them a curveball or will one be able to hook themselves the title of Forged in Fire champion?

Daniel goes back in time to when he had the red and black lumberjack (with the hat to match), introduces a new red-horse candidate to the Republican party.

Jenna avoids a new relationship in order to connect with her co-workers. Meanwhile, Tamara throws a chic birthday party for Sadie that leaves more than one partier feeling less than celebratory.

While responding to a potential carbon monoxide leak inside a home, Lt. Severide and Cruz uncover the remains of a child inside the chimney. Subsequent information leads Severide to believe that the discovery may be linked to a case he had worked on years ago. Meanwhile, with election day nearing, Casey braces for the worst in his run for Alderman, prompting Dawson to enlist the firehouse team to lend a hand to the cause. Complicating his chances, Alderman Becks continues to bad mouth Casey to the press, but an incident in the field might prove beneficial.

Angie fills in as staff sergeant while investigating a football player's wife's murder.

Amy and Liam have a secret that they don;t tell Karma;. Lauren and Shane attempt to do some damage control after Amy and Karma argue.

Conan is joined on the show by Niecy Nash and Chris Janson.

Jimmy is joined on the show by Susan Sarandon, John Cena and Michael Stipe.

Stephen welcomes Adam Driver, Rachel Bloom, and a musical performance by Savages.

Daredevil goes underground to save an old friend. Karen follows a dangerous lead. The law firm of Nelson & Murdock may have reached its final chapter.

Desperate for quick cash to fight the court case, the boys try to collect outstanding lot fees at the park and consider a return to petty crime.

Seth is joined on the show by Maggie Siff, John Heilemann, Mark Halperin and Stanton Moore.

James is joined on the show by Kunal Nayyar, Rob Corddry, Mireille Enos and Atlas Genius.

Sidney is Gary Bell's only friend left as he waits for news about whether he will be offered a reprieve. Sidney decides he will stand by his side even if certain members of the village complain.

The show takes a look at dark energy, the mysterious force that is unexpectedly causing the universe's expansion to increase.

Della is forced into the tertiary economy at the local car boot sale by an unexpectedly painful utility bill, while Germaine becomes cousin Cathy's unwilling assistant.

Thomas joins an enclave of new age seekers in So Cal in an effort to put his finger on the pulse of femininity.