Fourth Doctor audio stories

The Fourth Doctor has featured in several audio stories.

Regular

 * Mike Yates (Hornets' Nest, Demon Quest, Serpent Crest)
 * Fenella Wibbsey (Hornets' Nest, Demon Quest, Serpent Crest, The Thing from the Sea)
 * Sarah Jane Smith (Exploration Earth, The Paradise of Death, The Ghosts of N-Space, Glorious Goodwood, Short Trips)
 * Harry Sullivan (How to Win Planets and Influence People)
 * Leela (Zagreus, Night of the Stormcrow, Time in Office, The Light at the End, Second Sight, The Lady of Obsidian, The Enigma Dimension, Companion Chronicles, Jago & Litefoot, The Lost Stories, Fourth Doctor Adventures, Philip Hinchcliffe Presents, Short Trips)
 * K9 Mark I (The Time Vampire, Fourth Doctor Adventures)
 * K9 Mark II (Zaegrus, The Companion Chronicles, The Fourth Doctor Adventures)
 * Romana I (Companion Chronicles, Fourth Doctor Adventures, Short Trips)
 * Romana II (Companion Chronicles, Fourth Doctor Adventures, Short Trips, Destiny of the Doctor)
 * Adric (The Invasion of E-Space, Short Trips)

New Series Adventures
After the Twelfth Doctor was hit by energy from the time storm, he entered a degeneration cycle, going back from his eleventh incarnation to his first.