The Doctor discovers Castrovalva is a cursive occlusion, an impossible yet manifested Escheresque environment, with all pathways, no matter which direction one goes, leading back to the same point. It is a trap laid by the Master with no apparent way out. Written by
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[to Mergrave and Ruther
You have got to help me defeat him. GOT TO, do you understand?
[addressing them, also
You do have doubts. You've spoken of it often.
[Mergrave and Ruther don't know what to say
Well, say something, PLEASE! "Yes," would be best.
Featured in Directing Castrovalva