Former companion Freema Agyeman, who played Martha Jones in both Doctor Who and Torchwood, has been on Twitter to confirm her involvement with a documentary for BBC America.
Involvement in DW 50th anniversary? : I'm contributing 2a programme for BBC AMERICA but not involved in the drama. Excited 2watch tho! X
She also tweeted:
Would I play Martha Jones again? : Yes - under the right circumstances ie character development opportunity. X
Is this the same sort of involvement that John Barrowman announced earlier on This Morning, only time will tell.