Series from 1973
After saving the galaxy, alongside the first two Doctors, the Doctor regains control of his TARDIS and meets with Draconians, Daleks, and giant maggot…
In Wales, a dead miner is found glowing green. UNIT investigates and Jo empathizes with the environmentalism of Cliff Jones who is opposing the pollution from Global Chemicals.
Investigating the old mine workings, Jo and the miner, Bert, become trapped beneath the surface when the lift is sabotaged. Bert touches some green slime and becomes infected.
The Doctor and Jo discover the mine’s terrible secret. Global Chemicals’ managing director, Stevens is determined that they won’t live to reveal what they have learnt.
The Brigadier attempts to seal the giant maggots in the mine with explosives, but this only results in the creatures burrowing to the surface.
Captain Mike Yates is taken over by the supercomputer, BOSS and ordered to kill the Doctor. Cliff and Jo are trapped by the maggots as UNIT launch their attack.
Cliff is dying, and maggots are on the verge of transforming into giant flying insects. Time is running out for the Doctor as BOSS launches its plan for world domination.