Christopher Naylor

 was a voice actor who portrayed several roles in Big Finish audio stories, notably recreating the role of companion Harry Sullivan.

Credits
As Harry Sullivan

The Lost Stories

 * Return of the Cybermen

The Seventh Doctor Adventures

 * Sullivan and Cross - AWOL
 * London Orbital
 * Scream of the Daleks

The Third Doctor Adventures

 * Kaleidoscope

UNIT: Nemesis

 * Fire and Ice
 * The Curator's Gambit
 * The Man from Gallifrey
 * Power of the Dominators

Other Roles

Doctor Who Main Range

 * Black Thursday - James Hudd
 * The Kamelion Empire - Alternative Kamelion / Chaos Soldier

The Lost Stories

 * The Doomsday Contract - Villager

The Fourth Doctor Adventures

 * The Perfect Prisoners - Malpha / Sentreal / Trooper / Worker
 * Chase the Night - Bolan
 * The Tribulations of Thadeus Nook - Krillian / Cop / Halder
 * Blood of the Time Lords - Honourable Loric
 * Shellshock - Captain Max Beck / Captain Starling / Private Müller

The Eighth Doctor: The Time War

 * The Lords of Terror - Guard
 * Planet of the Ogrons - Ogron

The Tenth Doctor Adventures

 * One Mile Down - Pickus

The First Doctor Adventures

 * The Great White Hurricane - Policeman / Man with Ladder / Gang Member / Henry
 * The Barbarians and the Samurai - Captain Hamilton

Doctor Who Unbound

 * Dust Devil - Harry Sullivan
 * The Key To Key To Time - Harry Sullivan

The Diary of River Song

 * Whodunnit? - Lord Simon Whist / Captain Bartholomew / Discordia Underling
 * The Lifeboat and the Deathboat - Number Two / Computer / James

UNIT: Nemesis

 * Fire and Ice - Abiathar