Home TV Shows FBI Season 8 Finale Preview: Bioweapon Threat and OA’s Future

FBI Season 8 Finale Preview: Bioweapon Threat and OA’s Future

May 12, 2026

CBS’s FBI wraps up season eight with an episode that finds the team trying to stop the release of a bioweapon. Season eight, episode 22, “Defector,” will air on Monday, May 18, 2026 at 8pm ET/PT.

“Defector” Plot: The theft of a bioweapon from an unwitting defector forces the team to work with an old foe to secure the lethal pathogen and prevent an outbreak in N.Y.C. Also, OA’s future on the team is put into question. Aaron Ginsburg, Ryan Maldonado, and Eduardo Javier Canto wrote the season finale, and Alex Chapple directed the episode.

Missy Peregrym stars as Special Agent Maggie Bell, Zeeko Zaki plays Special Agent Omar Adom “OA” Zidan, Jeremy Sisto returns as Assistant Special Agent in Charge Jubal Valentine, Alana De La Garza is Special Agent in Charge Isobel Castille, John Boyd stars as Special Agent Stuart Scola, and Juliana Aidén Martinez plays Eva Ramos.

FBI Season 8 Finale — John Boyd as Special Agent Stuart Scola, Juliana Aidén Martinez as Eva Ramos, Missy Peregrym as Special Agent Maggie Bell, and Zeeko Zaki as Special Agent Omar Adom ‘OA’ Zidan in ‘FBI’ season 8 finale (Photo: Bennett Raglin © 2026 CBS Broadcasting, Inc)

FBI Season 8 Description, Courtesy of CBS:

FBI is a fast-paced drama about the inner workings of the New York office of the Federal Bureau of Investigation. This elite unit brings to bear all their talents, intellect, and technical expertise on major cases in order to keep New York and the country safe. Born into a multigenerational law enforcement family, Special Agent Maggie Bell commits deeply to the people she works with as well as those she protects.

Her partner is Special Agent Omar Adom “OA” Zidan, a West Point graduate via Bushwick who spent two years undercover for the DEA before being cherry-picked by the FBI. Overseeing them is Special Agent in Charge Isobel Castille, who operates under intense pressure and has undeniable command authority.

The team also includes Assistant Special Agent in Charge Jubal Valentine, the nerve center of the office, whose ability to easily relate to and engage with both superiors and subordinates makes him a master motivator, as well as Special Agent Stuart Scola, an Ivy League-educated Wall Streeter-turned-FBI agent. These first-class agents tenaciously investigate cases of tremendous magnitude, including terrorism, organized crime, and counterintelligence.