sentences:  In 2010, Charlie Jane Anders of io9 listed the cliffhanger of the third episode as one of the best cliffhangers in "Doctor Who" history.This is one of five "Doctor Who" serials that were never novelised by Target Books (the others being "City of Death", "Shada", "Resurrection of the Daleks", and "Revelation of the Daleks"), in this case because they were unable to come to an agreement with Douglas Adams that would have allowed him or another writer to adapt the script.BBC Books published a novelised version of the serial, written by James Goss, on 5 January 2017.