Series 3 Episode 6: The Lazarus Experiment

Summary:
The Doctor brings Martha home after their travels and wants to leave but then he hears that Professor Lazarus wants to change humanity and stays. Martha's sister works for Lazarus now and so the Doctor and Martha can watch the big experiment. First everything seems normal but then the capsule with Lazarus inside it has a malfunction and the Doctor shuts it down, so it won't explode. Lazarus comes out and is several years younger than before but everyone finds out soon that he starts to change into a monster. Can the Doctor save everybody before another human dies? He soon finds out that it's not so easy to kill Lazarus and they meet for the final showdown in a place of many memories.

This episode is a stand-alone story after the Dalek two-parter but that doesn't mean that it's bad. We meet Martha's family again and you can see that her mother doesn't like the Doctor. This storyline will be important at the end of series 3 but we don't know in which way yet. Mark Gatiss is just brilliant as Professor Lazarus in this episode. He's both a great writer and actor and the good quality of this episode is partly because of him. Martha and the Doctor are a real team now and at the end of the episode she even gets a Tardis key, which makes her a true companion. I also like Martha's sister Tish who will play a role later too. We still have a lot to look forward to in this series.