Six years have elapsed since Guantanamo Bay, leaving Harold and Kumar estranged from one another with very different families, friends and lives. But when Kumar arrives on Harold's doorstep during the holiday season with a mysterious package in hand, he inadvertently burns down Harold's father-in-law's beloved Christmas tree. To fix the problem, Harold and Kumar embark on a mission through New York City to find the perfect Christmas tree, once again stumbling into trouble at every single turn.

A high school valedictorian who gets baked with the local stoner finds himself the subject of a drug test. The situation causes him to concoct an ambitious plan to get his entire graduating class to face the same fate, and fail.