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.
Length 166 minutes
Jon Pertwee | Caroline John | Nicholas Courtney | John Levene | Olaf Pooley | Christopher Benjamin | Sheila Dunn | Derek Newark | David Simeon | Derek Ware | Walter Randall | Ian Fairbairn | Roy Scammell | Keith James | Peter Thompson | Philip Ryan | Walter Henry | Pat Gorman | Dave Carter | Barry Letts | Derek Martin | Terry Walsh | Ian Elliott | Alan Chuntz | Alan Clements