Meet guest stars of 'Unfinished Business'

Since FBI made its debut on CBS back in 2018, the immensely popular series has seen numerous characters come and go, both within its main cast as well as its weekly guest stars.

Season 4 has been no different with several new faces popping up with the arrival of each new episode.

But just who is set to appear in the cast of FBI season 4, episode 10 as the CBS bids farewell ahead of its winter break?

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FBI season 4 episode 9 release date and plot

Episode 9 of FBI season 4 airs at 8pm ET/PT on Tuesday, December 14th, 2021.

Titled Unfinished Business, the episode promises to be a dramatic one for our main cast as Rina is left critically wounded while heading to work with Jubal.

The team quickly begin investigating who could want Rina dead and they discover that the vengeful Vargas is responsible and that he somehow managed to plan the shooting from behind bars.

FBI season 4 episode 9 cast

As ever in FBI, the CBS series welcomes back its main cast of season 4 characters while also introducing us to a host of guest stars just for episode 9.

Appearing in episode 9 of FBI season 4 are:

Main and recurring cast

Missy Peregrym as Special Agent Maggie Bell
Zeeko Zaki as Special Agent Omar Adom ‘OA’ Zidan
Jeremy Sisto as Assistant Special Agent in Charge Jubal Valentine
Alana De La Garza as Special Agent in Charge Isobel Castille
John Boyd as Special Agent Stuart Scola
Katherine Renee Turner as Special Agent Tiffany Wallace
Kathleen Munroe as Rina Trenholm
David Zayas as Antonio Vargas
Taylor Anthony Miller as Kelly Moran
Vedette Lim as Elise Taylor
James Chen as Ian Lim
Roshawn Franklin as Agent Hobbs
Josh Breckenridge as ATF Rep Steve

Guest stars

Khalil Kain as Frank Castlewood
Adrian Alvarado as ATF Agent Sanchez
Hamish Allan-Headley as Logan Winters
Nat Cassidy as McCain
Danny Gavigan as Rob Dolan
Ross Alden as Trustee Julien
Asra Arif as Escort #1
Lindsey Bryce as Escort #2
Yaron Urbas as Lawyer
Aline Stokes as EMT
James Camacho as Delivery Person

Guest star spotlight

Khalil Kain as Frank Castlewood

The first guest star to appear on the cast list in epsidoe 9 is Khalil Kain as he takes on the role of Frank Castlewood.

Fans will likely know the 57-year-old actor best from his time as Darnell Wilkes on UPN and The CW’s Girlfriends while he has also held prominent roles in Bronx SIU, Be Someone and 1992’s Juice.

Adrian Alvarado as ATF Agent Sanchez

Adrian Alvarado arrives on episode 9 as the stern Agent Sanchez.

The New Jersey-born actor has almost 40 roles to his name with notable appearances coming in Law & Order: Special Victims Unit, For Life, and General Hospital where he played Det. Cruz Rodriguez in over 80 episodes.

Hamish Allan-Headley as Logan Winters

Hamish Allan-Headley is one of the least experienced guests in episode 9 as he has just 15 credits to his name.

However, fans will likely have spotted Hamish most recently in Mayor of Kingstown alongside Jeremy Renner.

Nat Cassidy as McCain

Nat Cassidy may not have tied down a recurring role so far in his career but the North Carolina-born actor has some big-name shows on his acting CV.

As well as his appearance in FBI, Nat has also appeared in single episodes of Quantico, The Good Fight, Blue Bloods and Bull to name a few.

Danny Gavigan as Rob Dolan

And finally, we come to Danny Gavigan who takes on the role of Rob Dolan in episode 9.

The actor made his debut back in the 2006 webseries Buddy Jackson and his since appeared in the likes of The Broken Continent, Last Night and Unarmed Man.