 The 1994 Doctor Who novel Nightshade is about an actor who starred in a thinly disguised version of Quatermass , discovering that the events of the serials are becoming reality . The fictional Professor Nightshade was also mentioned in subsequent novels . Author Mark Gatiss described the Nightshade serial in his notes accompanying the e @-@ book release as " a TV series that isn 't quite Quatermass and isn 't quite Doctor Who " , adding " I was utterly obsessed by Quatermass at that time " . 
