Inferno is the fourth and final serial of the seventh season of the British science fiction television series Doctor Who, which was first broadcast in seven weekly parts on BBC1 from 9 May to 20 June 1970. The serial remains the last time a Doctor Who story was transmitted in seven episodes. This serial was also the last regular appearance of Caroline John in the role of Liz Shaw.

Caroline Frances John was an English actress. She played classical roles on the stage and also portrayed Elizabeth "Liz" Shaw in the BBC science fiction television series Doctor Who, as well as several other television roles.