Martha Jones’ appearances in Torchwood have been visually confirmed in this Press Release from the BBC.
The accompanying photo shows Martha lining up with Jack Harkness, Gwen Cooper, Ianto Jones, Tosh and the slimy one. Kasterborous Forum marksmen are on hand to take Owen out if he lays a finger on the wonderful Dr. Jones.
Dr Jones? Why yes, of course! Martha stayed on Earth to resume her studies, and joins Torchwood after passing her exams!
Freema Agyeman says: “Martha has grown up a lot since Doctor Who. She’s now a fully qualified doctor and a bit hardened by life experiences. When she finds out that Captain Jack needs her help, she joins Torchwood for a while. She continues to develop her knowledge of alien intelligence, but this time keeping her feet on the ground.
Meanwhile, there’s a little hint of why Martha is appearing in Torchwood before returning to Doctor Who
Russell T Davies says: “Freema is a wonderful actress and we want to give her the chance to add another dimension to Martha. She is going to cause some waves in the team â€“ especially as she joins Torchwood at a point when everything is going to change for one of them.”
Freema it seems is also looking forward to the challenge of a new take on her character, in a new environment.
“And for me as an actress, it’s a great new challenge to be able to broaden and expand Martha as she develops in other directions for this more adult series. The Torchwood team are fabulous to work with and have made me very welcome.”
The release also confirms the casting of Richard Briers, Alan Dale (Neighbours, Ugly Betty, Lost) and James Marsters (Buffy the Vampire Slayer), with Briers playing “a reclusive millionaire who is the keeper of alien secrets”
You can also read about this at SFX.