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.

Khalil Kain as Frank Castlewood

Meet Guest Stars of 'Unfinished Business'

Q: 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.

By Marcus Vance

• Oct 8, 2026 • 4 min read

Meet Guest Stars of 'Unfinished Business'

Direct Answer • Key Takeaway

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.

Marcus Vance

Cybersecurity & Digital Privacy Researcher

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.

Tags: fbi season 4 episode 9 cast unfinished business guest stars