Billie Piper is wanted to return to 'Doctor Who' to celebrate the show's 50th anniversary next year.
The 30-year-old singer-and-actress and Karen Gillan - who portrayed the titular Time Lord's companions Rose Tyler and Amy Pond respectively - are both in line to reprise their roles in cameo appearances on the BBC One sci-fi programme to mark the milestone in "spectacular fashion".
A source told the Daily Express newspaper: "Next year is massive for the show. They are going to be pulling out all the stops.
"There will be plenty of nods to the show's remarkable history and some old faces are likely to be reappearing. Karen and Billie are two of the Doctor's greatest companions and it's hoped they will be involved."
Carole Ann Ford, who portrayed the Time Lord's first ever TV companion, Susan Foreman, in 1963 alongside the late William Hartnell - who starred as the Doctor - is also among those expected to make a cameo next year.
David Tennant - who portrayed the titular character for five years before quitting in 2010 - is another name linked with a return to the show, and he previously admitted he would be keen to make a guest appearance in the programme next year.
He said: "I'll always be able to come back in the alternate world because the Doctor will age like a normal human."
Current Doctor Matt Smith is guaranteed to still be in the lead role for the 50th anniversary shows next year after recently confirming he will still be playing the part.
He said: "We go into the 50th year all guns blazing and I'll be around."
Should Karen make a cameo on 'Doctor Who' it will be a swift return after only leaving the show last month in emotional episode 'The Angels Take Manhattan', which also saw her on-screen husband Rory Williams, played by Arthur Darvill, depart.