- John Lennon - Self (archive footage)
- Paul McCartney - Self (archive footage)
- George Harrison - Self (archive footage)
- Ringo Starr - Self (archive footage)
- Tony Barrow - Self
- Tony Bramwell - Self
- David Suchet - Self - Narrator (voice)
- Andrew Sachs - Self - Narrator (voice)
- Michael Cockerell - Self - Presenter
- Gar Alperovitz - Self - Presenter
- Nick Ross - Self - Narrator (voice)
- Michael Culver - Roger Bacon
- Peter Ustinov - Self - Narrator (voice)
- John Rowe - Self - Narrator (voice)
- Jonathan Miller - Self - Narrator (voice)
- Nicholas Le Prevost - Thomas More
- Michael Praed - Self - Narrator (voice)
- Paul Rhys - Cicero
- Owen Teale - Erucius
- Mark McGann - Sextus Roscius
- Christopher Good - Chair of judges
- Andrew Greenough - Capito
- Antony Byrne - Magnus
- Penny Downie - Caecilia
- Richard Ridings - Elder Sextus
- Tom Smith - Tiro
- Gerard Horan - Country gent
- Þorsteinn Gunnarsson - Jon Steingrimsson
- Richard Hammond - Self - Co-presenter
- Frances Barber - Annie Besant
- Rosalind Stockwell - Self - Narrator (voice)
- Juliet Stevenson - Self - Narrator (voice)
- Simon Sebag-Montefiore - Self
- Richard Mitchley - Self - Narrator (voice)
- Robin Ellis - Self - Narrator (voice)
- Christopher Frayling - Narrator (Voice)
Capítulo disponible en las siguientes plataformas:
