Eliza's long lost sister Bethany arrives for a visit and with her brings a host of unresolved issues that challenge Eliza's progress. Meanwhile, Henry attempts to defeat Freddy in the company's Tough Mudder for charity, and their long-simmering feud comes to a head.

Drew is committed to keeping Becky happy but his situation with Clare has his attention divided. Maya lies in order to protect Miles, but the guilt is eating her up. Imogen is determined to find out who is behind the crooked online venture that has everyone at Degrassi talking.

Gail seeks psychological help. Andy and Daryl discover a secret of their Dad's. Victor feels pressure from the community to make a decision.

Rick and Marty search the swamp for an alternate entrance into the Money Pit.

It is a story told in more than twelve hundred cultures around the world-the gods sent a great flood to wipe out humanity for its disobedient and wicked ways. Do these numerous creation myths point to an actual deluge, one that engulfed the world and spared only a chosen few? New evidence suggests that many fabled aspects of these flood myths may, in fact, be true. From traces of a major meteor impact in the Indian Ocean, to a worldwide ash layer, and even remnants of Noah's grave site, scientists are starting to put the pieces of a very deadly puzzle together-a puzzle that some believe was created by extraterrestrial beings. Did humanity narrowly escape extinction? And are the ancient stories correct-that alien beings are the reason we survived? Ancient Astronaut Theorists believe they are-and that celestial beings are poised to save us again when another catastrophe sweeps across the Earth.

When the roommates clash with Madison, she reveals a haunting secret; Bruno and Sylvia's romance is jeopardized by jealousy.

Tickle has his hands full keeping track of his liquor and Chico and Tyler are becoming suspicious. Bill and Josh build an underground bunker to hide their shine. Tennessee shiners, Mark and Digger, test an invention that could revolutionize moonshining.

When Brody gets his first ground floor paycheck he gets the sticker shock of his life. In an effort to downsize, he gives up his apartment and crashes with Jenny. But when crashing feels a lot like living together, Jenny freaks out. Normally Brody would turn to Mansfield for advice, but his boss has made it clear that this time he is on his own. Harvard and Derrick bet they know how to stretch their modest ground floor pay further than Brody.

Nina discovers that Trent and the district attorney's office are involved in a plot.

Abby starts to date Nate, a married dad with whom she had an emotional affair during her marriage. Max and Ford are honored at the Family Equality Gala and given an award by LGBT activist Adele Northrop.

An old friend asks Nina to set her up with Phil; Nina goes on an ill-fated double date.

Tonight guests are comedian Jerry Seinfeld and boy band One Direction. Musical guest will be hip-hop artist Big Sean.

Also Ice skaters wipe out; Tonight Show 12 Days of Christmas Sweaters; Tonight Show Stocking Stuffers; Jerry Seinfeld did a stand-up comedy bit; Jerry Seinfeld gives Jimmy an award; Big Sean featuring E-40 performed "I Don't Fuck with You"

Inspired by Hailey's passion, Rodrigo insists that she play with the orchestra, over the objections of Gloria (Bernadette Peters). Veteran maestro Thomas (Malcolm McDowell) tries to rise above his resentment of Rodrigo, only to face more humiliations. Hailey pays a late night visit to Alex, on the eve of her big day - the moment she's been waiting for.

The tension between Lee and Lucy reaches a new high, as the couple find themselves in uncharted emotional water. Frank takes Lee on a night out, leading to disastrous consequences that involve a traffic cone, arm wrestling on a zebra crossing and slow dancing to Whitney Houston. The police also find a item in Lee's possession that's stolen.

Lorna is full of yuletide spirit, in more then one way. Ben and Dale want to make Rachel's Christmas special, but Ken finds himself stuck in the middle.