Taverner is looking to protect MI5’s dangerous secrets in Slow Horses Season 4, Episode 4.

The star-studded cast ofSlow HorsesSeason 4, Episode 4 includes Hugo Weaving, Jack Lowden, and Jonathan Pryce.

SlowHorsesSeason 4, Episode 4 premiered on Apple TV+ on September 25.

Slow Horses Season 4 Episode 4 cast members

Lowden has credits inDunkirk,The Gold, andThe Long Song.

It even comes to a point that she would fire her if she makes another mistake.

Thomas previously appeared inGosford Park,Only God Forgives, andThe English Patient.

Gary Oldman as Jackson Lamb in Slow Horses Season 4, Episode 4

David is a retired MI5 officer and River’s grandfather who is suffering from dementia.

Pryce’s notable credits includeThe Crown,3 Body Problem, andThe Two Popes.

Reeves previously played DSU Rose Teller in the fan-favorite seriesLutherand even appeared in three episodes of the 2000Dunetelevision series.

Jack Lowden as River Cartwright in Slow Horses Season 4, Episode 4

The character is a former CIA operative who now works as a dangerous mercenary.

This revelation is uncovered by River Cartwright, making him and his father a valued target for Harkness.

MCU fans may recognize Weaving for his role as the Red Skull in 2011’sCaptain America: The First Avenger.

Kristin Scott Thomas as Diana Taverner in Slow Horses Season 4, Episode 4

The actor also appeared inThe Lord of the Ringstrilogy,Love Me, andV for Vendetta.

Eleazar’s notable credits includeHarlots,Deep Water,Class of ‘09, and more.

She is also part of Lamb’s team in trying to get to David Cartwright first before anyone else.

Jonathan Pryce as David Cartwright in Slow Horses Season 4, Episode 4

Edwards can be seen inPeaky Blinders,Luther, andSkins.

Roddy helps Lamb and the others with their pursuit of David Cartwright in Season 4, Episode 4.

Chung appeared inWaterloo Road,Neighbours, andNight Bus.

Saskia Reeves as Catherine Standish in Slow Horses Season 4, Episode 4

Kirwan starred inThis Is Going to Hurt,This Way Up, andDodo.

The character is played on-screen by Joanna Scanlan.

Scanlan is known for her roles inThe Larkins,Boat Story, andWicked Little Letters.

Hugo Weaving as Frank Harkness in Slow Horses Season 4, Episode 4

She also failed to inform Taverner that she knew about the fact that River Cartwright faked his death.

Fans may recognize Bradley for her roles inTed Lasso,Guilt, andThe Gold.

Claude even calls Taverner out for covering up the truth behind River’s misdeeds.

Rosalind Eleazar as Louisa Guy in Slow Horses Season 4, Episode 4

Callis’ notable credits includeCastlevania,Star Trek: Picard, andBlood & Treasure.

Gilder can be seen inShadow and Bone,The Gold, andSherwood.

Laith is known for his roles inAmerican Assassin,Deep State, andThe Devil’s Double.

Aimee-Ffion Edwards as Shirley in Slow Horses Season 4, Episode 4

New episodes ofSlow HorsesSeason 4 will be released every Wednesday on Apple TV+ at midnight PT.

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