The fall finale of FBI, a special two-part event that aired on Monday, December 15, 2025, delivered major action and a deeply personal crisis. The episode, titled “Lone Wolf”, featured the show’s full team of agents racing to stop a citywide terror attack while Jeremy Sisto’s character, Jubal Valentine, faced a parent’s worst nightmare.
This guide details the main cast and guest stars who brought this high-stakes episode to life and played pivotal roles in the season’s biggest story.
Meet the Main FBI Team in “Lone Wolf”
The episode featured the complete, regular team of FBI agents from the New York Field Office, each tackling the escalating crisis.
Missy Peregrym returned as Special Agent Maggie Bell. A sharp and dedicated agent, Maggie took a leading role in the field investigation. She worked with her partner to track the killer as the case quickly grew from a local murder to a widespread threat.
Zeeko Zaki plays Special Agent Omar Adom ‘OA’ Zidan. A former Army Ranger, OA partnered with Maggie in the relentless hunt. The pair conducted interviews and pursued leads on the ground even as citywide communications failed.
Jeremy Sisto stars as Assistant Special Agent in Charge Jubal Valentine. Jubal’s role became intensely personal. After receiving a call from his son, Tyler, who was near the developing danger, Jubal’s focus split between managing the crisis from headquarters and fearing for his child’s safety. His character is tested more than ever before in this episode.
Alana De La Garza plays Special Agent in Charge Isobel Castille. As the head of the New York office, Isobel coordinated the response to the multiplying threats. She worked closely with Jubal to assess the scale of the danger and direct the team’s resources.
John Boyd appears as Special Agent Stuart Scola. Known for his attention to detail, Scola worked with the team to contain the spreading threats and piece together the suspect’s larger plan.
Juliana Aidén Martinez portrays Special Agent Eva Ramos. A former prosecutor, Ramos worked alongside her colleagues in the field office to respond to the escalating situation.
Key Guest Stars and Supporting Characters
A mix of recurring and new guest stars filled out the episode’s story, driving the plot and raising the emotional stakes.
- Caleb Reese Paul played Tyler Valentine, Jubal’s son. Tyler contacts law enforcement after spotting a suspicious gunman, unknowingly putting himself at the center of the terror plot. His actions directly link Jubal’s professional and personal worlds.
- Clinton Brandhagen guest-starred as Warren Stroud, a character connected to the investigation.
- Vedette Lim and James Chen reprised their recurring roles as FBI analysts Elise Taylor and Ian Lim, providing critical support from the office.
- Thomas Philip O’Neill played Dr. Neil Mosbach.
- Suzy Jane Hunt appeared as Janice Stroud.
Additional guest actors included Hanna Mandel as Effy O’Rourke, Kristian Mosley as Vesper Green, and Dave Register as Brandon Kraczuk.
What Happened in the Fall Finale Episode “Lone Wolf”?
The episode began with the team investigating the murders of three s*x workers in a New York brownstone. What seemed like a serial killer case rapidly unfolded into something far worse. The agents discovered the victims were part of a scheme to steal key cards and credentials from city employees.
They soon realized these thefts were not random crimes but steps in a coordinated plan to attack the city’s infrastructure. The situation reached a critical point when a massive explosion, triggered by the suspects, destroyed a key part of New York’s fiber-optic network. This attack knocked out cell service, emergency communications, and law enforcement channels across the city.
With the team isolated and operating without contact, the personal stakes soared for Jubal. He learned the explosion happened near his son Tyler’s last known location. The first part of the finale ended with Jubal frantically searching the rubble and finding Tyler seriously injured and unconscious.
“I was in New York during 9/11… to play those scenes and to sort of reflect on all those people’s experiences… it’s not something we take lightly,” Jeremy Sisto said about filming the intense disaster scenes.
The second hour of the finale followed the immediate aftermath. While Tyler received hospital treatment, Jubal, defying Isobel’s orders to stay with his family, pursued a suspect off the books. In a raw and unscripted moment, he applied extreme pressure to the suspect’s bullet wound to extract information, an act the actor confirmed was improvised. The team eventually thwarted a second, larger planned attack. The episode closed on a hopeful note as Tyler woke up and Jubal was left to grapple with the extreme actions he took while his son was in danger.
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Episode Release and Streaming Details
“Lone Wolf” premiered as part of a two-hour fall finale event on CBS. It aired on Monday, December 15, 2025, at 8:00 PM ET/PT, an hour earlier than the show’s usual time slot due to the double episode.
For viewers who missed the live broadcast, the episode is available to stream on Paramount+. New episodes typically arrive on the streaming platform after they air on CBS.
The series is now on a midseason break. New episodes of FBI Season 8 are scheduled to return on Monday, February 23, 2026.
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