124a. Mission of the Viyrans
Synopsis
The Doctor and Peri take a holiday on the planet Gralista Social, but soon discover they aren't the only time-travelling aliens in town.
Written By: Nicholas Briggs
Directed By: Barnaby Edwards
Cast
Peter Davison (The Doctor); Nicola Bryant (Peri); Peter Sowerbutts (Lawrence); Philip Childs (Chris)