|with the Third Doctor (Jon Pertwee)|
Elizabeth was so popular that, when she left the show, it drew media attention that only the changing of the Doctor's portrayers had previously-garnered.
|with the Fourth Doctor (Tom Baker)|
It wasn't picked up, but Elizabeth returned to the Sarah Jane role in "The Five Doctors", playing opposite Jon Pertwee once more as all The Doctor's incarnations (along with various aides) were brought to Galifrey, his home planet.
Elizabeth played Sarah Jane once more on the resurrected Doctor Who (the first human character from the earlier series to do so) in "School Reunion".
|with the Tenth Doctor (David Tennant)|
|with the Eleventh (current) Doctor (Matt Smith)|
The result was The Sarah Jane Adventures, with Elizabeth leading a motley group of teens, including Sarah Jane's adopted son, against alien threats to Earth.
The series, now in it's fifth year, is among the highest-rated kids' shows in England.