The Countdown cast features Jensen Ackles, Jessica Camacho and Violett Beane. This info article contains minor spoilers and character details for Derek Haas’ Amazon series. Check out more cast guides in Vague Visages’ Know the Cast category.

Countdown centers on a group of undercover agents in Los Angeles. After the murder of a homeland security officer, an FBI agent assembles a talented yet unpredictable crew. The narrative follows the main protagonists as they bend the rules while investigating an underworld conspiracy. Here’s every actor and character in Countdown.

Read More at VV — Know the Cast: ‘Reacher’

Countdown Cast: Jensen Ackles as Mark Meachum

Character Profile: An LAPD detective from the robbery and homicide division. He is a “man of the people” who previously worked undercover in a prison. Mark privately deals with a terminal cancer diagnosis.

Ackles’ Resume: Eric Brady in Days of Our Lives (1997-2000), Alec in Dark Angel (2001-02), Dean Winchester in Supernatural (2005-20), Tom Hanniger in My Bloody Valentine (2009), Sheriff Beau Arlen in Big Sky (2022-23)

Read More at VV — Know the Cast: ‘The Terminal List’

Countdown Cast: Jessica Camacho as Amber Oliveras

Character Profile: A DEA agent. She spent 14 years undercover. Amber struggles with a drug addiction problem while developing a bond with Mark.

Camacho’s Resume: Sophie Foster in Sleepy Hollow (2015-16), Gypsy in The Flash (2017-18), Santana in Taken (2018), Emily Lopez in All Rise (2019-23), Pirate Jenny in Watchmen (2019)

Read More at VV — Know the Cast: ‘We Were Liars’

Countdown Cast: Violett Beane as Evan Shepherd

Character Profile: An FBI agent. She specializes in cyber crimes. Evan impresses her colleagues by staying one step ahead of them with her work.

Beane’s Resume: Jesse Wells/Jesse Quick in The Flash (2015-18), Taylor in The Leftovers (2015), Cara Bloom in God Friended Me (2018-20), Markie Cameron in Truth or Dare (2018), Imogene in Death and Other Details (2024)

Read More at VV — Know the Cast: ‘Expats’

Countdown Cast: Elliot Knight as Keyonte Bell

Character Profile: An FBI agent. He specializes in terrorist threats. Keyonte deals with “legacy” criticism, as his father was also an FBI agent.

Knight’s Resume: Merlin in Once Upon a Time (2015), Ward Phillips in Color Out of Space (2019), Abraham in Your Lucky Day (2023), Colin in The Boys (2024), Davide in Hacks (2024)

Read More at VV — Know the Cast & Characters: ‘I’m a Virgo’

Countdown Cast: Uli Latukefu as Luke Finau

Character Profile: An LAPD detective. He spent 18 years in the gang and narcotics division. Luke shares a bond with Mark due to their longtime partnership.

Latukefu’s Resume: Byamba in Marco Polo (2014-16), Cole in Alien: Covenant (2017), Dwayne Johnson in Young Rock (2021-23), The Champion in Black Adam (2022), Callum in The Last Anniversary (2025)

Read More at VV — Know the Cast & Characters: ‘Citadel’

Countdown Cast: Eric Dane as Nathan Blythe

Character Profile: An FBI agent. He leads a unique task force. Nathan is a Princeton University graduate who served in the U.S. Army.

Dane’s Resume: Mark Sloan in Grey’s Anatomy (2006-), Multiple Man in X-Men: The Last Stand (2006), Sebastian in Marley & Me (2008), Tom Chandler in The Last Ship (2014-18), Cal Jacobs in Euphoria (2019-22)

Read More at VV — Know the Cast & Characters: ‘Dead Ringers’

The Countdown cast also includes:

• Bogdan Yasinski as Borys Volchek
• Rachel Armstrong as Heather
• Merrick McCartha as DA Grayson Valwell
• Jonathan von Mering as Andrej
• Jonathan Togo as Damon Drew
• Matt Kaminsky as Jerry
• Nikolay Moss as Danill
• Nick Bardin as Dmitry Kotov
• Cameron Gayden as Memo
• Ryan de Quintal as Rolf
• Kamy D. Bruder as Kirill
• Scot Ruggles as Adic Jay Tostrud
• Milo Ventimiglia as Robert Darden
• Emily Bridges as Meredith Darden

Q.V. Hough (@QVHough) is Vague Visages’ founding editor.