Time Tunnel (audio story)

 was the third story of the fifth season of Big Finish Productions' Short Trips series. It was read by Katy Manning.

Summary
Reports are coming in to UNIT of trains emerging from a railway tunnel in Sussex, their passengers and drivers dead. The Doctor elects to drive a train through the tunnel himself, but when he emerges Jo sees to her horror that he is covered in ice. Something in the tunnel has driven him close to the point of death. What can it be?

Characters

 * Third Doctor
 * Jo Grant
 * Brigadier Lethbridge-Stewart
 * Mike Yates
 * Sergeant Benton

Continuity

 * Jo compares the folly to the castle on Peladon. (TV: The Curse of Peladon)
 * Yates worked in the Army before joining UNIT. (AUDIO: The Rings of Ikiria)
 * After the Doctor notes he may have been forced to regenerate in the tunnel, the Brigadier comments "three of you is quite enough". (TV: The Web of Fear, The Invasion, The Three Doctors)
 * The Doctor is angry at the Brigadier for destroying an innocent creature with explosives. (TV: The Silurians)