A sabotaged TARDIS has to make an emergency landing on a ship that is en route to the derelict space station Terminus. However, the station isn't as derelict as it appears, it's the last stop for the ship's cargo of lepers.

Trapped amongst the victims of the highly contagious Lazar's disease, the Doctor and his companions must find a way back to the TARDIS. As Nyssa falls ill, who are the mysterious armoured figures closing in?

The Doctor and his companions have reached the Terminus. As they unravel its mysteries, they discover a terrible danger that could threaten the entire Universe!

As Terminus prepares to jettison its reactors, can the Doctor wrest the TARDIS free of the disease-ridden space station or is it truly the end of the Universe?