"Human Nature" was originally a novel by Cornell that was published by Virgin Books back in 1995 Showrunner Russell T Davies was a fan of the book When he brought back the show in 2005, he invited Cornell to adapt the story for the show It became a two-part episode in Davies' second season.
"Human Nature"[...]
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After turning the classic television show into books for the masses early in his career, Dicks would go on to work on Virgin Books and BBC Books' Doctor Who: New Adventures in the 1990's, shortly before the television series was re-launched in 2005.
While Doctor Who introduced Dicks to the literary world, he later reinvented himself as a children's book[...]