An adventure featuring the Fifth Doctor, Adric, Nyssa & Tegan.
When the Doctor (Peter Davison) tries to take Tegan (Janet Fielding) back to Heathrow Airport, the TARDIS arrives in the 17th century instead of the 20th century.
The time-travellers discover that a space capsule has landed nearby and its alien occupants intend to wipe out life on Earth by releasing rats infected with a great plague.
- Cat. No.