When DC Parlov returns to the precinct to report his latest manuscript being stolen, Terry, Jake and Rosa go undercover at a fantasy convention to catch the culprit.

Barry and Iris's wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth's mightiest heroes - Green Arrow, Supergirl, The Flash and White Canary - lead their teams into battle to save the world. Part 1 - Supergirl - S03E08 Part 2 - Arrow - S06E08 Part 3 - The Flash - S04E08 Part 4 - DC's Legends of Tomorrow - S03E08

'Tis the season to learn about history's finest Yuletide stories, from George Washington crossing the Delaware to Charles Dickens's creation of modern-day Christmas, with guest stars Ken Marino, Rob Corddry and Colin Hanks.

Riggs and Murtaugh are led into the underground mob world as they investigate a murder in a hospital. Meanwhile, Murtaugh learns that Riana is secretly dating his neighbor and nemesis' son. Also, Riggs spends more time with his childhood friend, Molly, and Scorsese's real name is revealed.

As the case of the St. Joseph's Three leads to its unexpected conclusion, Sharon attempts to balance the case, the arrival of her family and her fast approaching wedding to Lt. Andy Flynn.

Episode info coming soon ..

Flash, Arrow, White Canary, Firestorm, and Alex attempt to return to Earth-1. Meanwhile, Felicity and Iris work together to free Kara before Eobard and Fuehrer Queen take out her heart and transplant it into Overgirl.

Episode info coming soon ..

Nine artists are revealed as safe by America's votes. The bottom 2 artists then compete for the Instant Save and one is eliminated.

Randall and Beth are faced with a hard choice. Jack takes Randall on a college tour.

Actors Sterling K. Brown and Lyric Ross and writer Shukree Hassan Tilghman discuss Deja's complicated foster relationship with Randall and Beth after the events of "Number Three."