Maisie Williams
Joivan Wade originally appeared as Rigsy in "Flatline" in Series 8. Maisie Williams featured as Ashildr/Me in "The Girl Who Died" and "The Woman Who Lived". Robin Soans appeared as Luvic in "The Keeper of Traken" in Season 18. Simon Paisley Day made an appearance in "The End of the World" from Series 1.