When Murray's brother, Marvin, visits, there is a surprise in store.

As Erica resists helping Bev prepare their traditional Thanksgiving dinner, Murray worries that he's losing Adam to his ne'er-do-well brother, Marvin.

Beverly insists the entire family gather for the holiday, but tension builds when brother-in-law Marvin tricks Pop-Pop into thinking Thanksgiving was at his house.Meanwhile, Pops passes the torch to Barry and Erica to give the holiday toast, resulting in them trying to one-up each other.

A mutual love of "Knight Rider" brings Murray and Uncle Marvin to the Philadelphia Thanksgiving Day parade to see the car K.I.T.T. in person. However, their bonding doesn't last long due to a slighted Adam. Meanwhile, Beverly's Turkey Day plans go awry after she invites Bill and Lainey to celebrate the holiday

Inspired by the "Karate Kid" films, Adam and the other Adam Goldberg face off in a karate match to settle once and for all a long-running feud. Barry and Adam go to Uncle Marvin for training, but the only thing they learn is how to clean an apartment. Meanwhile, when Erica and Geoff's relationship becomes public, they realize that they aren't the good guys.

As the school year comes to a close, Barry and Erica wonder what they’ll be voted for in the yearbook and pressure Adam – who’s on staff – to see the rough layout before it goes to print. But when they accidentally delete it, mass panic ensues and messes up Adam’s relationship with Jackie.  Meanwhile, Murray is annoyed when Marvin comes to visit for money, but Beverly convinces him to help Marvin out with a plan, because he’s family.

Graduation Day is quickly approaching, and Erica cannot wait to get out of the house, until it dawns on her how much Beverly's love means to her. She attempts to delay her graduating so she can stay home. Later, Barry has plans for him and Lainey, but they turn to dust. Meanwhile, Dana makes a surprise visit just as Adam and Jackie officially become a couple.

When The Ottoman Empire’s business declines due to a new furniture competitor, Adam offers to make Murray a commercial starring Marvin, but things go awry when Marvin’s actions mess up the original plan. Meanwhile, Beverly offers to help Barry as he keeps striking out as he attempts to get a girl at school.

During the holiday, Uncle Marvin reveals he has become a stockbroker and convinces Barry and the JTP to invest their money with him. Meanwhile, Erica tells Geoff she is in debt and gets swept up in the family investment. Later, Beverly invites 50 people over for a Thanksgiving potluck instead of stressing out cooking for the family.

Barry thinks he wants a wild, adult bachelor party; but he ultimately realizes Adam’s idea of a party to celebrate his brother as a bachelor is more his speed. Meanwhile, Murray never spends money on himself, so Beverly surprises him with an expensive sports car.

Much to Beverly’s chagrin, Barry is thrilled that he gets to celebrate Christmas now that he is engaged to Lainey. Meanwhile, Murray’s brother Marvin makes a promise to Adam with a surprising outcome.

Beverly's patience with Pop Pop is put to the test due to his endless Thanksgiving demands; Barry and Erica are ready to return home for the holiday, but Uncle Marvin accidentally drives them to Pittsburgh.

With her due date approaching, Erica is over the exhausting pregnancy and demands a "babymoon." When things take an unforeseen turn, Geoff is tasked with producing the one person Erica needs more than anyone. Meanwhile, Adam and Barry seek out advice on "uncle-ing" from some unexpected sources.  

It's Thanksgiving, and no one crushes Turkey Day like Beverly Goldberg; though, with the loss of Murray, this holiday feels a bit different. Geoff and Erica are stressed over the new baby; and, even more worrisome, an unexpected Goldberg relative arrives. With everyone highly suspicious of this unforeseen visitor, things are likely to go off the rails at any moment.