User:SOTO/Forum Archive/The Reference Desk/@comment-165.228.133.90-20130925042257/@comment-1398253-20130926000808
From Tardis Wiki, the free Doctor Who reference
18 down is definitely Monk, as in the Meddling Monk. If 20 across is Troy, that was in The Myth Makers. Both stories are Hartnell's, so I can understand you not knowing the answers.