Sebastian Croft as Atti

Emilia Jones as Orla

Kate Nash as Boudicca

Nick Frost as Arghus

Craig Roberts as Nero

Kim Cattrall as Agrippina

Derek Jacobi as Claudius

Rupert Graves as Paulinus

Lucy Montgomery as Birte

Tony Gardner as Antonius

Alex Macqueen as Sycophantus

Tony Way as Brigantes Warrior

Dominique Moore as Traveller

Kevin Hudson as Senator

Marek Larwood as Gladiator With A Funny Voice

Sarah Hadland as Irene the Iceni

Sanjeev Bhaskar as Mr Felix

Dave Lamb as Dougal

Jessica Ransom as Drusilla

Tom Stourton as Percy

Richard David-Caine as Soothsayer

Lawry Lewin as Sandal Seller

Katy Wix as Watling Street Presenter

Katherine Jakeways as Julia

Alexander Armstrong as Catus Decianus

Lee Mack as Decimus

Warwick Davis as Gladiator Trainer

Jamie Demetriou as Dimidius

Kevin Bishop as German Legate

Samantha Spiro as Mrs Felix

Ella Smith as Mrs Dougal

Dan Renton Skinner as Chief of the Army

Dustin Demri-Burns as Cedric

Tim Downie as British Legate

Chris Addison as Colin

John Eccleston as Rattus Rattus (voice)

Keir Charles as Doctor

Anna Crilly as Flavia

Jordan Scowen as Celcius

Jason Forbes as Sweat Seller

Tobi Bamtefa as Severus

Terry Deary as Gaulish Legate

Paul Bazely as Egyptian Legate

Joanna Bacon as Brenda

Ncuti Gatwa as Timidius

Ben Ashenden as Messenger

Jalaal Hartley as Weedy Messenger

Mike Wozniak as Owen Bowen

Martin Brown as Roman Attendant

Philip Harvey as Centurian

Oliver Simms as Celt Warrior - Enemy Tribesman (uncredited)