The BBC has declined to comment on reports that actress Billie Piper is to leave sci-fi drama Doctor Who at the end of the next series.
Billie Piper has enjoyed a successful acting career
The Daily Mirror reported Piper, 23, who plays sidekick Rose Tyler, wanted to avoid being typecast.
She will next be seen in a Christmas Day special alongside new Time Lord David Tennant.
But a BBC spokesman said: "We are not commenting on the third series - we are still working on the second series."
"Rose has a whole new journey and a fantastic set of adventures to go on with the brand new Doctor, starting in the special on Christmas Day," he added.
"Viewers will then see them return in a host of scary and exciting stories in a new series next year."
Piper has played Doctor Who's sidekick Rose Tyler in the series since it was revived earlier this year.
Leading actor Christopher Eccleston left after the first series, and has been replaced by Tennant for the second series, which is now being filmed.