Make sure you don't forget that the second of this year's special 'Doctor Who's Greatest Moments' documentaries will air tonight at 8pm on BBC Three. It will be the second of three in its series and tonight's episode will take a look at The Doctor's many companions. Each episode of the series celebrates an aspect of Doctor Who by reliving its greatest moments since the show's revival in 2005. Many new interviews with the programme's cast and crew feature on the documentaries and you can view a preview clip from tonight's episode below;

The first episode of this series aired last week and it took a look at both the ninth and tenth incarnations of The Doctor. Following tonight's episode, the third and final documentary will air on the third of September and that will take a look at The Doctor's enemies and villains. Like with the first two episodes of the series, the third part will also air on BBC Three at 8pm and more information about it will be posted here on this site as soon as it becomes available. A reminder for the episode will also be posted here on this site on its date of transmission. Will you be watching this greatest moments documentary when it airs tonight?