The Snow Golem visits the Fire Kingdom; the guys square off against a tiny cat assassin.

With only 9 castaways left in the running for the $1 Million, this episode is a recap on the journey thus far and with all the Survivors trying to get to the top, it is full of unseen footage.

Frankie's parents, Pat and Tag, invite the Hecks to spend a few days at their house to celebrate Thanksgiving together. But the festivities begin to fall apart quickly when Frankie's sister, Janet, and her family also join in, and soon the siblings are at each other's throats over their widely differing parenting techniques.

When the Ava show takes a break, Reagan is thrilled to spend the week at home with Amy, but her type-A personality and defiant sense of justice upset the delicate balance of Chris's neighborhood social life. Meanwhile, Ava tries to win over Kevin's daughter by giving her vocal lessons for a performance at school.

The fourth elimination is announced.

Tessa can't stand the thought of spending Thanksgiving in the 'burbs so Dallas takes Tessa for a day in the city. While out having fun, they come across George making out with a woman even though he said he'd be working. Tessa angrily confronts George about his lying at the Royces' Thanksgiving dinner.

Hard as it is to swallow, cutting-edge theories are suggesting that our universe may not be the only universe. Instead, it may be just one of an infinite number of worlds that make up the multiverse. Brian Greene takes us on a tour of this brave new theory at the frontier of physics, explaining why scientists believe it's true and showing what some of these alternate realities might be like. Some universes may be almost indistinguishable from our own; others may contain variations of all of us, where we exist but with different families, careers and life stories. In still others, reality may be so radically different from ours as to be unrecognizable. Brian Greene reveals why this radical new picture of the cosmos is getting serious attention from scientists. It won't be easy to prove, but if it's right, our understanding of space, time and our place in the universe will never be the same.

By spinning the Wheel of Mythfortune, the MythBusters find themselves taking on five random viewer-suggested myths with titles like the Monty Hall Paradox, Lumber Car, Firearm Fashion, Hit the Deck and Flaming Tire. Keep those ideas coming!

When an old neighborhood kid returns to town as a hugely successful internet billionaire, it gets Phil thinking of what could have been. Jay feels Manny could use a little dose of constructive criticism, and Cameron is offended when Mitchell questions the authenticity of his colorful childhood stories.

Highlights from the season are presented.

Alex designs a dress for Jane to wear to her charity event while Penny helps out Max with babysitting duties. Dave and Brad decide to strike up a friendship with their odd mailman.

The contestants provide food for the local rodeo and its audience.

Having discovered that her most valuable ally has turned against her, Emily desperately reaches out to her mentor for advice. Victoria's worst nightmare comes true when she finds herself totally alone both in her life and her home, while the threat of Tyler's negative influence continues to grow.

Hayden conspires with Tate and Nora to drive Vivien insane and take the unborn twins for herself. Meanwhile, Violet must choose whether to support her mother or not, while the full story of the deaths of Chad and Patrick, and the origin of Rubber Man, are revealed.

Why are humans so different from every other species on Earth? Did we evolve from ape - or is our intelligence the result of contact with an otherworldly source? Could unexplained advances in human evolution be the work of interstellar beings? 10,000-year-old petroglyphs link our ancient ancestors with star beings. Might evidence of alien contact help unlock the mystery of the Creation of Man?

Justin Bieber, Hugh Fink

Chelsea Handler, Dwight Howard, Gloriana

Ty Burrell, Wilford Brimley

A heatwave hits London and Adam can't sleep. He is not the only one plagued by nightmares; elderly parishioner Joan (Sylvia Syms) has just moved into a nursing home and is convinced her new room is haunted. Adam is called on to justify believing in the Holy Ghost but not spooks.

And there are demands at home too; Alex and Adam have a pint-sized house guest in the form of Adam's difficult goddaughter Enid.