Joseph Lidster is an English playwright and screenwriter, best known for his work on the Doctor Who spin-off series Torchwood and The Sarah Jane Adventures. He started his career writing Doctor Who audio plays for Big Finish Productions in 2002. Numerous further audio plays and prose short stories followed for Big Finish, for their Doctor Who line, spin-offs and other series (Sapphire & Steel and The Tomorrow People). In 2005, he started working for the BBC, writing tie-in material for the new Doctor Who television series. He made his television writing debut in 2008 on the second series of Doctor Who spin-off Torchwood and subsequently wrote three two-part stories for The Sarah Jane Adventures and two two-part stories for Wizards vs Aliens. Lidster wrote for the 2014 CBBC sitcom Millie Inbetween.