Sarah meets her second Sontaran

Tags: Fourth Doctor, Sarah Jane Smith, Harry Sullivan, Sontarans

The Sontaran Experiment, episode 2
1 March 1974

Having teleported down from the Ark, the TARDIS crew find a verdant and unspoiled Earth, ready for habitation. Ready that is, barring one unsavoury alien visitor and his experiments ­- a visitor Sarah thinks she's met before.....