The Stolen Earth
Sladen later returned to "Doctor Who" in the show's fourth series in the concluding episodes "The Stolen Earth" and "Journey's End" and was credited in the title sequence of both episodes. Her final appearance in "Doctor Who" was a scene in the concluding part of "The End of Time", Tennant's last episode as the Doctor. Just before her death, Sladen had also been interested in being involved in the "Doctor Who" Fourth Doctor Big Finish series.