A national tragedy forces Olivia to return to work at the White House. Meanwhile, we learn more about the first few days of Fitz’s presidency.

A national tragedy forces Olivia to return to work at the White House. Meanwhile, we learn more about the first few days of Fitz’s presidency.

As Oliver and Helena grow closer, Oliver trains her to be his ally, complete with showing her how to use a crossbow. Diggle disapproves of Oliver sharing his secret with Helena as he’s not sure she can be trusted, but Oliver refuses to listen to his concerns. Helena’s quest for revenge proves to be too strong for Oliver to handle after she kills the head of the Triad and all hell breaks loose.

Mike helps his brother Rusty move some furniture into the Heck family’s garage, only to realize the furniture is stolen; Frankie hopes to land a part-time job in a department store so she can get a discount on Christmas presents.

When a bearded, rotund man in a red Santa suit with an ID reading Kris Kringle falls from the sky in Central Park, Castle and Beckett are on the hunt to find the person who killed Santa. But everything isn’t holiday cheer, as they discover St. Nick may have been more naughty than nice. Meanwhile, Castle and Beckett prepare for their first Christmas together.

Robin is determined to get Barney back no matter what it takes. Meanwhile, Ted fills in as Marvin’s Nanny, leading Marshall and Lily to realize that Ted is using baby Marvin to replace his other baby, the GNB building.

Saul catches up with an old friend and discovers evidence of covert activities by Estes. Brody and Vice President Walden find themselves at odds over the future of their political relationship, while Dana and Finn come to terms with their own differences.

While Will defends a man accused of murder, Alicia tries to help by assisting a prosecutor in another county who is trying a different man for the same crime. The Justice Department puts heat on Eli. Nick takes action that forces Kalinda’s hand.

Waylaid by a ferocious storm, Adama, Coker and Becca reluctantly follow their eccentric savior, marine recon sergeant Xander Toth, to shelter in an abandoned ski lodge. Adama and Coker finally find some common ground and secrets about Becca’s mysterious mission are revealed.

The tentative safety of the ski lodge is abruptly shattered as Cylons breach Toth’s defenses. With Becca and Toth nowhere to be found, Adama and Coker face off against their deadly robotic pursuers. Becca makes a horrifying discovery about the Cylons’ agenda on Djerba.