Harry Sullivan

Surgeon-Lieutenant Harry Sullivan was a companion of the Fourth Doctor.

He was a Royal Navy surgeon in the employ of UNIT and later worked for NATO and MI5.

He had a younger step-brother named Will. (AUDIO: Buried Secrets)

Harry first encountered UNIT while he worked in the Royal Navy, at the same time the Third Doctor had briefly left Earth in his TARDIS for Peladon. (PROSE: The Face of the Enemy)

After he had joined UNIT and the Third Doctor was apparently in a coma, the Brigadier summoned "Dr Sullivan" to help see him through the process. When Sergeant Benton woke the Doctor by offering him a cup of coffee, the Brigadier cancelled the call for Dr Sullivan's assistance. (TV: Planet of the Spiders)

Three weeks after confronting the Great One on the planet Metebelis III, the Doctor and his TARDIS re-appeared in his laboratory at UNIT HQ. The Doctor had received a fatal dose of radiation, forcing him to regenerate or die. (TV: Planet of the Spiders) Harry Sullivan arrived on the scene just moments after the Doctor regenerated into a new form. (TV: Robot)

After the defeat of the robot K1, Harry found himself in the Doctor's TARDIS. (TV: Robot) At first very much confused, he trailed the Doctor and Sarah Jane Smith to Space Station Nerva, where they were pitted against the Wirrn. (TV: The Ark in Space)

They then travelled by transmat from the space station to an uninhabited far future Earth. Harry fell into a trap set by the stranded GalSec colonist Roth, but was able to find a way out. He later tried to help a dying dehydrated prisoner held captive by Styre for his experiments, but was too late. He looked after Sarah when Styre's experiment caused her to pass out from fear. Under the Doctor's instructions, Harry removed the terullian diode bypass transformer from Styre's ship, which caused the energy Styre fed on in his ship to feed on Styre instead. (TV: The Sontaran Experiment) Heading back to the Nerva beacon, the Time Lords intercepted the transmat beam and took them to Skaro to prevent the creation of the Daleks. (TV: Genesis of the Daleks)