The Doctor transmits Sarah and Harry down to Voga to cure Sarah of the Cybermat's poison but Kellman's sabotage means he is unable to bring them back.
Did You Know?
The story was partially filmed at Wookey Hole Caves, a location renowned for bad luck. As if to confirm local superstition about the site, an electrician broke his leg, Elisabeth Sladen
's motorboat went out of control, and one of the stuntmen was injured getting her out of the water and ended up in hospital. See more