Fourth Doctor audio stories

The Fourth Doctor has featured in several audio stories.

Audio companions of the Fourth Doctor

 * Mike Yates (Hornets' Nest, Demon Quest, Serpent Crest)
 * Fenella Wibbsey (Hornets' Nest, Demon Quest, Serpent Crest, The Thing from the Sea)
 * Sarah Jane Smith (BBC Audio Dramas, Short Trips)
 * Harry Sullivan (Short Trips)
 * Leela (Main Range, Special Releases, The Companion Chronicles, The Lost Stories, Fourth Doctor Adventures, Philip Hinchcliffe Presents, Short Trips)
 * K9 Mark I (The Companion Chronicles, Fourth Doctor Adventures)
 * K9 Mark II (Main Range, The Companion Chronicles, The Fourth Doctor Adventures)
 * Romana I (The Companion Chronicles, Fourth Doctor Adventures, Short Trips)
 * Romana II (The Companion Chronicles, Fourth Doctor Adventures, Short Trips, Destiny of the Doctor)
 * Adric (The Companion Chronicles, 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.