OK! Magazine may have printed a huge 50th anniversary spoiler (or a shocking mistake) in their latest issue.

Spreading the net currently is a purported magazine scan from said publication that appears to confirm another popular companion is returning in addition to the already confirmed Billie Piper.

Although we have doubts about this one, this is spoiler tagged just in case:

Spoiler: show

The countdown is on for Doctor Who fans as the iconic show prepares to celebrate its 50th birthday with a bang. A 75-minute anniversary episode has secretly been filmed to mark the occasion, which will see favourites including David Tennant, Catherine Tate and Billie Piper returning to our screens alongside the most recent Doctor, Matt Smith. After producers teased the nation with incredibly brief snippet trailers of the one-off episode, entitled The Day Of The Doctor, OK! caught up with David and Catherine to see if we could get them to spill the beans on what the scriptwriters have in store for us. ‘Ask me anything, I don’t work for the BBC any more so don’t care,’ David quipped before an executive decided to step in! Here, the duo talk about moving on from Doctor Who, their concerns about returning to the show and working with David’s reported rival, Matt Smith… [Scan] The text, which precedes an interview with David Tennant and Catherine Tate, says:

We do know the companion in question was keen to reprise the role, so it’s not entirely out of the question.