Doctor Who Target Books is a 23-book series with 22 released primary works first released in 1975 with contributions by John Peel, Terrance Dicks, Malcolm Hulke, Ian Marter, Gareth Roberts, Eric Pringle, Eric Saward, Wally K. Daly, Stephen Wyatt, Ben Aaronovitch, Gary Russell, Russell T. Davies, Robert Shearman, Jenny T. Colgan, Keith Temple, Phil Ford, Mark Gatiss, and Pete McTighe.