"Heaven Sent" AnalysisAn unusual episode for a talented actor - the Steven Moffat-written "Heaven Sent" sends the Twelfth Doctor to the ultimate escape room. But he is the only player. A Doctor in mourning for Clara, faced with a silent, deadly enemy, and a mystery to be solved with time - can this be called the best Twelfth Doctor episode?In their look into the TARDIS library, the co-hosts look at two different Big Finish adventures, one with the War Doctor and the other with the Eighth Doctor and Charley.