Written by Cavan Scott and Mark Wright
Directed by Ken Bentley
Sound Design and Music by Howard Carter
Sylvester McCoy (The Doctor),
Sophie Aldred (Ace),
Philip Olivier (Hex),
Stephen Chance (Sir William Abberton),
Maggie O'Neill (Captain Lysandra Aristedes),
Philip Dinsdale (Sergeant Jarrod),
Ingrid Oliver (Helen / Oracle).
1999: Leaving her infant son behind, a young mother named Cassandra Schofield departs Bolton, seeking a better life amid the lights of London.
2004: Despite the best efforts of the time-travelling Doctor, 'Cassie' Schofield dies on Dartmoor, a vampirised victim of the sinister organisation called The Forge.
2021: All grown up, and a nurse at St Gart's Hospital, Thomas Hector Schofield - known as 'Hex' - meets, and becomes a companion to, that time-travelling Doctor. but remains unaware that his alien friend knew his mother, and watched her die.
1854: In the Crimean War, Hex takes a bullet, and is seriously injured. The Doctor promises to return him to St Gart's.
2025: Now. In a London ravaged by a deadly contagion. destiny awaits.