Common Side Effects Season 1 (2025)

High school lab partners Marshall and Frances uncover a conspiracy by big pharma and the government to suppress a rare mushroom that could cure all diseases

Marshall is on the run, trying to flee New York; Frances confides to her boss, Rick, about the mushroom; Rick sends her to Marshall's farm to get more, but the situation gets out of hand

Marshall seeks advice from his old mentor, Hildy. Copano and Harrington are drawn further into the mystery of the mushrooms obtained at the raid.

Marshall buys a plot of land near a chemical waste site with a plan to grow more mushrooms; Frances rushes home from Europe after a huge development; Copano and Harrington investigate a connection between Marshall and Frances.

Marshall, Frances, and their crazy neighbors deal with the aftermath of a dangerous incident.

Marshall arrives in jail and learns that some very important people refuse to let him out, while danger lurks around every corner. Frances makes a fateful decision. Copano and Harrington pick up the pieces.

Marshall is rescued by a fellow prisoner and is now in his debt. Frances struggles with a life-changing event.

Marshall meets an old friend and forges a new plan. Frances receives terrible news and is therefore torn.

Marshall finds out what Hildy is up to, but still faces obstacles. Copano and Harrington get on Marshall's trail.

Agents from the FBI and the DEA storm the site - with tragic consequences. The fate of the mushroom is decided.