Still reeling after learning about Lena's secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle.

When Lucifer and Chloe investigate the death of a woman, they discover that they may be pursuing the wrong suspect. Then, Charlotte risks her safety when she decides to take matters into her own hands, and just as Lucifer makes a huge confession, he gets a tragic phone call that changes everything.

After a former band mate talks Kevin into reuniting with their old band, Smokefish, with hopes of making it big, Vanessa realizes a chance encounter with the band in her past changed the course of her life.

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The top 10 artists perform live for America's votes. Clarkson performs her show-stopping new single, "I Don't Think About You". This week's theme is "Challenge Week", in which the artists will focus on overcoming an obstacle in any aspect of the performance. The challenge could be song or genre-based, or having to do with performance and stage presence - each tackling something that they see as a challenge on their journey to become a well-rounded artist.

Francine falls in with a group of tough girls after becoming the new school guidance counselor. Jeff panics when he loses his hat.

When Adam and Don realize they need to bring in more business, they film a commercial advertising their company. Also, Andi works up the courage to ask her boss for a raise.

Richard's plan to reveal the Krew Kut Dually at the Lone Star Throwdown hits a snag when rain forces him to come up with a new plan to re-introduce it to its fans.

When Liv consumes the brain of a vice detective who doesn't play by the rules, her newfound recklessness gets her into trouble. Meanwhile, Major is coming really close to discovering Liv's secret.

Fresh off making the Dean's List, Franco decides to apply for a prestigious art fellowship, but in order to win a semester studying in Italy, he must compete with his girlfriend, Tavi. Also, Randy gets more than she bargains for when she hires Tush as her personal assistant.

Devon and Conrad race against the clock to save the life of a woman who is deteriorating fast from undetermined symptoms. When the patient turns out to be a hero who helps previous criminals get their lives back together, the team relies on her family of ex-cons to help diagnose and treat her. Tensions rise as Nic continues her search for evidence to incriminate Lane, but must simultaneously tend to her sister, Jessie, who is rushed into the ER. Meanwhile, York returns to the hospital with his mother, who is in need of a risky procedure, and comes face-to-face with the stone-cold Dr. AJ Austin.

Deaths under mysterious circumstances create paranoia among the men, and some of the crew may be considering mutiny.

A motorcyclist leads officers on a chase down city streets. Even a dead car battery doesn't stop a grieving man from eluding the police. A jumpy driver fails to avoid the cops and gives an awkward apology to his girlfriend.

Jude is forced to confront his past when he travels back to Oakland to seek assistance from a former colleague. Meanwhile, Caleb reaches out to Marshall after noticing heightened security around the camp; and Sophie experiences an unexpected setback with her plan to help Reece reunite with her daughter.

Watson and her half sister, Lin, have conflicting reactions when their estranged biological father dies. Also, Holmes and Watson find themselves on the hunt for a stolen plutonium shipment they fear will be used to make a dirty bomb after a Department of Energy inspector is killed with a lightning gun.

An all out battle ensues as The Lord Commander does everything in his power to capture Mooncake, and stop Gary and Quinn from closing the entrance to Final Space.

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Stephen welcomes actor Jim Parsons, Alexis Ohanian, co-founder of Reddit, plus a musical performance by Lake Street Dive.

After helping the League of Freedom save the world, Dr. Devizo and his team of villains move into the Mansion as bona fide heroes. The team struggles with their new roommates as Robobot travels across the country in search of the elusive Swine Kampf.

With her political capital on the rise, Coco sets her sights on a new role. But a startling discovery forces her to rethink her future at Winchester.

Jealousy flares in Martin and Beatrice. Simone and Rasmus meet a doctor with a connection to their father. A memory haunts Jean.

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Coming Soon...

After handing out 18 aprons on the first day of cooking, the judges are looking for six more cooks to round out the top 24. The cooks who were given a second chance will battle it out in a challenge.

As the pressure builds from all sides, Gaskell takes a huge risk to save his trial. An unwelcome discovery threatens Dom's career and his relationship with Lofty. Elsewhere, an angry relative puts Fletch's professionalism to the test.

Daniel takes on teaching his new pupil using the unconventional techniques from Mr. Miyagi. Robby is tempted to return to his delinquent ways. Johnny helps Miguel with his first date.

Hannah finds herself caught in the middle when Nathan and Christie clash on a highly charged divorce case involving fertility law and the ownership of frozen embryos. Ruth continues to evade questions regarding Oscar's return and the concern over Defoe's finances.