Written by Robert Sloman
"But, Doctor, don't you understand? I've got to go! This Professor Jones, he's fighting for everything that's important, everything that you've fought for"
| Episode Title | Premiere Date |
| Episode 1 | 19/05/1973 |
| Episode 2 | 26/05/1973 |
| Episode 3 | 02/06/1973 |
| Episode 4 | 09/06/1973 |
| Episode 5 | 16/06/1973 |
| Episode 6 | 23/06/1973 |
The Doctor and UNIT are called in to investigate a series of mysterious deaths at a disused mine in South Wales, where all the victims were found with their skin glowing green. As the Doctor becomes suspicious of the nearby Global Chemicals factory and its mysterious ‘Boss’, his assistant, Jo, becomes trapped underground – in an abandoned mine infested with deadly giant maggots!
Cast & Crew
The Doctor: Jon Pertwee
Jo Grant: Katy Manning
Brigadier Lethbridge-Stewart: Nicholas Courtney
Captain Mike Yates: Richard Franklin
Sergeant Benton: John Levene
Cliff Jones: Stewart Bevan
Stevens: Jerome Willis
Bert: Roy Evans
Nancy: Mitzi McKenzie
Voice of BOSS: John Dearth
Producer: Barry Letts
Director: Paul Bernard
Scriptwriter: Robert Sloman
