Synopsis by Hal Erickson
In the third episode of the six-part story "The Green Death," the Doctor (Jon Pertwee) runs up against a stone wall of corporate resistance in trying to persuade the Global Chemical Plant from polluting the nearby Welsh countryside. Adopting a disguise, he invades the company's executive offices, where he makes a startling discovery concerning Global's "CEO." Meanwhile, Jo (Katy Manning) has concluded that even greater dangers than mere toxic waste are lurking in the shadows. First telecast on June 2, 1973, "The Green Death, Episode 3" was written by Robert Sloman.