Topping! And toppling!
Here’s proof that you can put a whodunit in a science fiction program far easier than you can put science fiction in a whodunit.
In a fast-paced and equally quickly-resolved two-part story, our TARDIS classroom arrives in 1920s England for a cricket match and a bit of masquerade murder. Adric and Tegan drop into comfortable spots at the party (the buffet and the dance floor, respectively), while Nyssa learns the highs and lows of having a doppelganger. And the Doctor? Well, let’s just hope that harlequin mask smells better on the inside than we fear it might.