Whilst attempting a detailed scan of E-Space, K9 detects the trail of a large spacecraft. Seeking a lead for their escape, the Doctor sets out on its trail towards a misty yellow planet. Arriving just in time to witness a crash-landing in the planet’s swamps, the Doctor and his crew discover a number of escaping prisoners fleeing from someone claiming to be a Witchfinder... whilst terrifying ‘familiars’ float around them. For this is the planet of the witches... and the witches may just know the way home.