The pictures show a Sontaran in a butler's attire and The Doctor's Silurian ally Madame Vastra (Neve McIntosh) dressed in a black veil, both on the set of the hit sci-fi series.
Madame Vastra had this week been rumoured to be returning to Doctor Who when images of her ally Jenny (Catrin Stewart) on set also appeared online.
The popular duo of Madame Vastra and Jenny made their first appearances in series six's 'A Good Man Goes to War', where they joined The Doctor, the Ponds and a Sontaran warrior in battling Madame Kovarian (Frances Barber).
Madame Vastra, Jenny and the Sontaran will be returning for a Mark Gatiss-penned episode, which is to air in 2013.
McIntosh denied that she was to appear again in Doctor Who last week, when she tweeted: "No-one's asked me [to come back]."
Dame Diana Rigg and her daughter Rachael Stirling will also be appearing in the Gatiss instalment, but the exact nature of their roles is not yet known.
Doctor Who kicks off series seven on BBC One in the UK and BBC America in the US with 'Asylum of the Daleks'.
Watch Madame Vastra and Jenny in Doctor Who below: