DOCTOR WHO: FOUR TO DOOMSDAY

The Fifth Doctor (Peter Davison) discovers that his attempt to return Tegan (Janet Fielding) to Heathrow Airport has brought the Tardis to a spacecraft that appears abandoned at first, but actually carries a force of frog-like aliens that may challenge the future of humankind on Earth. Also featuring Nyssa (Sarah Sutton) and Adric (Matthew Waterhouse).