Ultimately the character was not deemed a success by the programme's makers, and Lane's contract was not extended beyond episode two of The War Machines. To replace her, two new characters, Polly (Anneke Wills) and Ben (Michael Craze), thought to be more in tune with the "swinging sixties", became companions.
Steven returns at the same time that a young woman wanders into the TARDIS thinking it was a real police box. The Doctor and Steven are taken aback when she introduces herself as Dodo Chaplet and reveals that her grandfather was French. The Doctor speculates that Dodo might be Anne's descendant. As some have pointed out, this would mean Anne lived to have an illegitimate offspring (unless she married a man of the same name).
In her travels with the Doctor, Dodo travels to the far future, unfortunately bringing the common cold with her to infect humanity's descendants; faces the mad games of the Celestial Toymaker; witnesses the gunfight at the O.K. Corral; says good-bye to Steven in The Savages; and is hypnotised by the rogue artificial intelligence WOTAN in The War Machines.
Halfway through that last adventure, she abruptly departs for a rest in the country after being hypnotised, and never reappears. At the story's conclusion Polly (who, with Ben Jackson, took Dodo's place as a companion) explains to the departing Doctor that Dodo has decided to remain in the 20th Century.
The canonicity of the novels in relation to the television series is open to interpretation.