Nyssa worked non-stop to create a vaccination ... a time-traveling ship disguised as a British police box. The Doctor, played by various actors over the years, encounters numerous foes and allies ...

Also reacting in Behind the Sofa is Katy Manning, who played Third Doctor companion Jo Grant; '80s companions Matthew Waterhouse (Adric), Janet Fielding (Tegan), Sarah Sutton (Nyssa), and Sophie ...