Actress Billie Piper has left Doctor Who fans guessing over whether she'll return as Rose Tyler.
Billie, who played the Time Lord's assistant for two series before quitting in 2006, made a comeback in the last series of the show.
The fifth series won't be broadcast until 2010, with four specials shown in 2009.
But Billie says she still hasn't made up her mind whether she'll be appearing.
Billie told The Radio Times magazine: "I haven't thought about it," but added "at some point you've just got to let go".
The actress, who is expecting her first baby with her actor husband Laurence Fox, said being a mum was the most important thing.
Some people had said Billie's voice sounded different during recent episodes of Doctor Who.
But Billie told the magazine she didn't have any problems with her speech, it was just they had been filming in cold weather.