While you were having a busy and productive Saturday (in bed), BBC One released its extended trailer for the Doctor Who 50th anniversary special, The Day of the Doctor.

If your office looks eerily empty today, it's probably because the majority of your colleagues are closeted Who fans (or to give them their proper name, Whovians) and are still recovering from a severe case of spoiler overload.

The trailer reveals former Doctors David Tennant, Matt Smith and John Hurt are brought together for the first time in some sort of time war, gate-crashed by Daleks, Zygones and, naturally, Queen Elizabeth I (played by Joanna Page from Gavin and Stacey...). And if that isn't sensational enough, the fact Billie Piper reprises her role as pouty Rose Tyler should be plenty to stir your nerdy young loins.

Check it out below and ready yourself for the full 75 minute special, which airs on BBC One at 7.50pm on Saturday 23 November.