Doctor Who’s Producer Marcus Wilson has made a bold claim believing no fans will be able guess the mystery behind Clara.

Speaking in TV & Satellite Week he said: “What’s lovely this year is that we’ve also got a thread running through these eight very different, very exciting stories – the mystery of Clara.

“She’s the impossible girl. The Doctor has met her twice before and both times she died. This time he’s determined to keep her alive and to discover who or what she really is.

He adds: “It’s a riddle that won’t easily be cracked. I defy anybody to guess it. Steven Moffat has found a way to lead everybody down the garden path and then knock them over with surprise at the end.”

Sounds like a challenge…