01/01/2013 10:48 am ET Updated Dec 06, 2017

'Parenthood': Cancer Leads Kristina To Shave Her Head And More Revealed In Previews (VIDEO)

When "Parenthood" returns (January 1 at 10 p.m. EST on NBC), Kristina's battle with cancer is far from over.

The first of the NBC drama's final four episodes of Season 4, titled "Keep On Rowing," sees Kristina make the bold choice to shave her head before chemotherapy causes her to lose her hair. Monica Potter, who plays Kristina, told HuffPost TV that the New Year's Day episode is her favorite, partly because Dax Sherpard, who plays Crosby on the series, directed it. "You see her going out with the girls, getting out of the house and trying to have fun with Julia [Erika Christensen] and Jasmine [Joy Bryant] and Sarah [Lauren Graham] and wanting to feel like she's normal again," Potter said. "It's sort of heartbreaking to see what happens when she does try to act normal and go out ... There's not one flat line of emotion; it's everywhere."

See a preview of Kristina's emotional decision in the first promo below of "Keep On Rowing." “It's about how the world is now seeing her. It's one thing [for you] to know that you have something, but it's another to walk around and have everybody in the world know," "Parenthood" showrunner Jason Katims told TVLine of the episode. “It actually becomes a very uplifting and moving story between Adam [Peter Krause] and Kristina. There’s a lot of humor in it.”

Read the full episode description and find out why Jasmine is "buttering up" Crosby and why Julia isn't as thrilled as one would imagine after Victor gets an A in two more sneak peeks below:

Jasmine and Crosby contemplate the future of their family as they welcome a new roommate. Kristina and Adam go on a much needed date night after she makes a drastic change to her appearance. Jasmine (Joy Bryant) and Crosby (Dax Shepard) help a family member who is experiencing money problems. Kristina (Monica Potter) surprises Adam (Peter Krause) with a new look and a spontaneous night on the town. Sarah (Lauren Graham) and Hank (Ray Romano) experience an interesting evening together. Meanwhile, Victor (Xolo Mariduena) is disappointed after Julia (Erika Christensen) gives him news about his mother.

"Parenthood" returns on Tuesday, January 1 at 10 p.m. EST on NBC.