The Sontaran Experiment: Part Two 1975
7.3 365 The Doctor learns that Styre has been experimenting on the Galsec crewmembers to pave the way for a Sontaran invasion of Earth and decides the only way to halt his plans is to challenge him to a duel.
Runtime: 25 min
Starts: Tom Baker, Elisabeth Sladen, Ian Marter, Kevin Lindsay
Director: Rodney Bennett