Missy needs to find the Doctor. However, it's very important it's the right Doctor - shewouldn't want to accidentally slip up and meet an earlier incarnation bymistake, because the consequences of that could be truly catastrophic... Cast: Michelle Gomez (Missy), Sylvester McCoy (The Doctor), Bruce Alexander (Scratch), Jonathan Case (Mortimer), Amerjit Deu (Voltaire), Jon Edgeley Bond (Klank), Paksie Vernon (Alisa).Other parts played by members of the cast.