The BBC has unveiled details of four free Dr Who "interactive episodes" that will be made available from the official website.

The games will be developed by Sumo Digital with contribution from Revolution Software's Charles Cecil and stories written by Phil Ford (co-writer Doctor Who - Waters Of Mars) and James Moran (Severance, Torchwood Children Of Earth).

"Children don't just watch Doctor Who, they join in. They make up games, invent their monsters, create their own stories," says Steven Moffat, executive producer, Doctor Who. "Now, there's something else - now, they can be The Doctor in brand-new episodes. Doctor Who - The Adventure Games will offer fans of The Doctor a unique opportunity to enter his world, face his challenges and grapple with his deadliest foes."

"By developing these games alongside the new TV series, we've been able to weave exciting narrative strands with the very finest game design to create a new kind of Doctor Who, which can be enjoyed by the whole family."

"There aren't 13 episodes of Doctor Who this year, there are 17 - four of which are interactive." added Piers Wenger, Head of Drama, BBC Wales. "Everything you see and experience within the game is part of the Doctor Who universe. We'll be taking you to places you've only ever dreamed about seeing - including locations impossible to create on television."