Dodo is introduced at the end of the serial "The Massacre of St Bartholomew's Eve". In that story, the Doctor and Steven travel to 1572 Paris, where they witness the persecution of the city's Huguenot population. Despite befriending a young woman named Anne Chaplet, the Doctor knows he cannot prevent the coming massacre of 10,000 Huguenots, including Anne, by the Catholic French authorities. He therefore leaves in the TARDIS, taking Steven with him. When Steven finds out, he is furious and considers leaving the Doctor while the TARDIS is in 1960s London.