Terrance Dicks worked on scripts for The Avengers as well as other series before becoming Assistant, and later full Script Editor of Doctor Who from 1968. Dicks worked on the entirety of the Jon Pertwee Third Doctor era of the programme, and returned as a writer - scripting Tom Baker's first story as the Fourth Doctor: 'Robot'. His later script writing credits on Doctor Who included the 20th anniversary story 'The Five Doctors'. Terrance Dicks novelised many of the original Doctor Who stories for Target books, and has written original Doctor Who novels for BBC Books. Robert Banks Stewart, the original script writer of 'Loch Ness Monster', has been one of the most prolific and respected writers on British television since the 1960s. Originally a journalist, he moved on to work developing movie scenarios at Pinewood Studios and then into script writing. As well as working as a script editor, he has written extensively for television, including The Avengers, The Sweeney and Doctor Who.