Overview

UNIT is providing security cover at an experimental drilling project at Eastchester, designed to penetrate the Earth's crust and release a previously untapped source of energy. Soon, however, the drill head starts to leak an oily green liquid that transforms those who touch it into vicious primeval creatures with a craving for heat. The Doctor is accidentally transported "sideways in time" by the partially repaired TARDIS control console into a parallel universe where the drilling project is at a more advanced stage. Thwarted by his friends' ruthless alter egos, he works to save both universes.

Top Cast

Jon Pertwee

The Doctor

Caroline John

Liz Shaw / Section Leader Elizabeth Shaw

Nicholas Courtney

Brigadier Lethbridge-Stewart / Brigade Leader Lethbridge-Stewart

John Levene

Sergeant Benton / Platoon Under Leader Benton

Olaf Pooley

Professor Stahlman / Director Stahlman

Christopher Benjamin

Sir Keith Gold

S

Sheila Dunn

Petra Williams / Dr Petra Williams

Derek Newark

Greg Sutton

David Simeon

Private Latimer

D

Derek Ware

Private Wyatt

W

Walter Randall

Harry Slocum

I

Ian Fairbairn

Bromley