Mark, in an attempt to bond with his stepson Darren, insists on teaching him how to throw a handmade boomerang that was gifted to Darren by his father. The two soon find themselves on a trek deep into the Jersey woods in search of it, where they encounter the Jersey Devil himself. Meanwhile, David is the recipient of a sex doll that he swears he didn't order, and is put through the wringer trying to return it.

Mark, Tammy, Hank, and Darren discover a magical, immersive, Jumani-style board game where they have to overcome their interpersonal differences in order to survive. David, facing the most important deadline and worst writer's block of his career, seeks solitude.

Mark, trying to prove to Tammy that he can get babies to like him, writes a hit song that becomes the next Baby Shark. He enlists his family and neighbors to join his management team, putting these relationships to the test during his meteoric rise and humiliating fall. Meanwhile, David tries to capitalize in Mark's wake by resuscitating his old and out of touch climate change educational magic act.

Mark goes into business with Gary & Barry's Water Ice Shoppe, a Glantontown institution, when faced with being deprived of his favorite summer snack during their annual winter closure.