Caroline John's daughter Daisy reprises her mother's role as Liz in The Third Doctor Adventures- Volume Five: Primord, where Liz is infected by samples of Stahlman's gas and psychologically corrupted to try and infect all of humanity with the gas, nearly infecting the Doctor until he is able to pass on instructions to the Brigadier and Jo about how they might be able to help him resist the mutation long enough to find a cure. Daisy reprises the role again in Series 9 of The Diary of River Song, where Liz is put out to be relegated to assistant to UNIT's new temporary scientific advisor, River Song - the Doctor's future wife- while the Doctor is otherwise engaged.