While Simon Pegg, Hannah Khalique-Brown and Alex Jennings have returned, there are some notable absences this time around, with the likes of Adrian Lester and Mark Rylance no longer in the cast.
Brooke plays the wife of Pegg's character Danny, with this season seeing Danny hunting a mole inside GCHQ, after the devastating cyber attacks seen in season 1.
The main cast for The Undeclared War is as follows. Scroll on to find out more about the season 2 characters, plus where you may have seen the actors previously.
Simon Pegg as Danny PatrickHannah Khalique-Brown as Saara ParvinSiân Brooke as Barbara NapierAlex Jennings as David NealDanny Sapani as Charlie FrancisEd Stoppard as Richard MarstonChloe Pirrie as Roz CavendishGerman Segal as Vadim TrusovJoss Porter as Phil DraperSeason 1 cast
Adrian Lester plays Andrew MakindeMark Rylance plays John YeabsleyMaisie Richardson-Sellers plays Kathy FreemanAlfie Friedman plays Gabriel DaviesSimon Pegg plays Danny Patrick
Where have I seen Simon Pegg before? The actor, comedian and screenwriter is perhaps best known for starring in Spaced, Shaun of the Dead, Hot Fuzz, The World's End, Paul, the Mission: Impossible film franchise, and as Scotty in the rebooted Star Trek film franchise, while he also had a recurring role as Hugh Campbell in The Boys.
Hannah Khalique-Brown plays Saara Parvin
Where have I seen Hannah Khalique-Brown before? Khalique-Brown has had roles in series including Doctors, Dune: Prophecy, Black Doves, Wolf Hall and Virdee, as well as films such as What's Love Got to Do with It? and Barbie.
Siân Brooke plays Barbara Napier
Where have I seen Siân Brooke before? Brooke is known for her roles in series including Sherlock, Doctor Foster, Good Omens, Guilt, Supacell, House of the Dragon, Blue Lights and Trying.
Alex Jennings plays David Neal
Where have I seen Alex Jennings before? Jennings is perhaps best known for playing royals, in both The Queen (in which he played Prince Charles opposite Helen Mirren as Queen Elizabeth II), and in The Crown, in which he played the Duke of Windsor in the first two seasons.
He's also starred in the likes of Unforgotten, A Very English Scandal, Gold Digger, Small Axe, The Lady in the Van, This Is Going to Hurt, Your Christmas or Mine, Mr Bates vs the Post Office, The Agency, MobLand, Dirty Business and Legends.
Danny Sapani plays Charlie Francis
Where have I seen Danny Sapani before? Sapani has had notable roles in series including The Bill, Doctor Who, Misfits, Penny Dreadful, The Bastard Executioner, The Crown, Harlots, Killing Eve, The Diplomat, The Way and Halo, as well as films such as Star Wars: The Last Jedi, Black Panther, The Ministry of Ungentlemanly Warfare and The Amateur.
Ed Stoppard plays Richard Marston
Where have I seen Ed Stoppard before? Stoppard has had roles in series including Upstairs Downstairs, Silent Witness, Home Fires, The Frankenstein Chronicles, Knightfall and Franklin, as well as films such as Youth, The Princess and Golda.
Chloe Pirrie plays Roz Cavendish
Where have I seen Chloe Pirrie before? Pirrie has had roles in series including Black Mirror, War & Peace, Death in Paradise, The Crown, Troy: Fall of a City, Temple, The Queen's Gambit, Hanna, Under the Banner of Heaven, Carnival Row, Dept. Q and Industry, as well as films such as Emma. and Burn Burn Burn.
German Segal plays Vadim Trusov
Where have I seen German Segal before? The Russian actor is known for roles in the likes of The Red Ghost and Vodovorot, and also appeared in Wolf Hall.
Joss Porter plays Phil Draper
Where have I seen Joss Porter before? Porter has had roles in series including Wolf Hall, Humans, Doc Martin and Wars.
Adrian Lester plays Andrew Makinde
Where have I seen Adrian Lester before? Lester became a household name in Britain for his role as conman Mickey Stone in long-running series Hustle, while he has also starred in the likes of Life, Riviera, Doomsday, The Day After Tomorrow, Renegade Nell, The Sandman and Ponies.
Mark Rylance plays John Yeabsley
Where have I seen Mark Rylance before? The Oscar-winning actor is known for Bridge of Spies, Ready Player One, The BFG, Dunkirk, The Trial of the Chicago 7, and for playing Thomas Cromwell in Wolf Hall, amongst many other acclaimed and high profile roles.
Maisie Richardson-Sellers plays Kathy Freeman
Where have I seen Maisie Richardson-Sellers before? The British actress is best known for starring in The Kissing Booth film franchise, and for her work on the series DC's Legends of Tomorrow, as well as The CW series The Originals. Since starring in The Undeclared War she has had roles in series including Wolf Hall and Nine Perfect Strangers.
Alfie Friedman plays Gabriel Davies
Where have I seen Alfie Friedman before? The Undeclared War was Davies's first on-screen credit.
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