Joe Sims

 voiced several characters for Big Finish Productions, notably as the Tenth Doctor's companion Mark Seven.

He also played Deputy Marshal Amhost in the television story The Power of the Doctor.

Credits
As Mark Seven

Dalek Universe

 * The Dalek Protocol
 * Dalek Universe 1
 * Buying Time / The Wrong Woman
 * The House of Kingdom
 * Dalek Universe 2
 * Cycle of Destruction
 * The Trojan Dalek
 * The Lost
 * Dalek Universe 3
 * The Dalek Defence / The Triumph of Davros

The Diary of River Song

 * Queen of the Mechonoids

Other Roles

Doctor Who

 * The Power of the Doctor - Deputy Marshal Arnhost

The Fourth Doctor Adventures

 * The Primeval Design - Jim Berenger
 * Stone Cold - Tench

The Tenth Doctor and River Song

 * Precious Annihilation - Abe Porter / Mr Chauncey / Pat

The Third Doctor Adventures

 * The Rise of the New Humans - Chief Orderly / Wilde / Jumper

The Paternoster Gang

 * Spring-Heeled Jack - Sergeant Grout / Spring-Heeled Jack / Arthur