text: For "The Five Doctors" – the show's 20th anniversary special – Carole Ann Ford, Nicholas Courtney, Elisabeth Sladen, Lalla Ward, Wendy Padbury, Caroline John, Richard Franklin, John Leeson and Frazer Hines reprised their roles as, respectively, Susan Foreman, Brigadier Lethbridge-Stewart, Sarah Jane Smith, Romana, Zoe Heriot, Liz Shaw, Mike Yates, K-9 and Jamie McCrimmon. The special was broadcast between the twentieth and twenty-first seasons.
  Davison, Fielding and Strickson continued on until Fielding stepped down from the role in Resurrection of the Daleks. She was replaced in Planet of Fire by Nicola Bryant as Peri Brown, a serial which also marked the final appearance of Strickson and Flood. Davison was replaced by Colin Baker in The Caves of Androzani and Bryant was replaced with Bonnie Langford as Mel Bush, a few years later, after her character was killed off in Mindwarp. Sylvester McCoy took over from Baker in Time and the Rani and Langford was replaced by Sophie Aldred as Ace at the end of the twenty-fourth season. The series was axed in 1989, but a TV movie was made in 1996 which saw Paul McGann taking over from McCoy and Daphne Ashbrook making her first and only appearance as Grace Holloway.