Ahead of the UK DVD and Blu-Ray release of Series Four in its entirety on January 23rd 2012, Merlin is holding a very special online giveaway for our loyal fans.
Over the coming days Merlin will be giving away more than 20 exclusive prizes online but here's the mystery part - we won't tell you what they are. It's up to you to solve the clues posted on the Official Facebook Page to work out what they will be - a signed DVD? Signed calendar? Action figure? Let the challenge commence...
All you need to do is enter your email address into the form below to be in with a chance of winning one of Merlin's fantastic prizes.