The show returns to television screens this weekend and fans will be able to re-live the adventure with two DVD releases starting with next month.
A second volume and a complete series boxset will be released on 23rd January.
All three are available to pre-order from Amazon.co.uk, Play.com and HMV.com
Starring Colin Morgan, Bradley James, Angel Coulby, Katie McGrath, Anthony Head and Richard Wilson with John Hurt as the voice of the dragon, series 4 sees the most dramatic change yet in the fortunes of our heroes and is destined to become the most exciting series so far.
The DVDs will feature a huge amount of exclusive bonus features including a making of series 4 documentary, cast & crew audio commentaries, out-takes, deleted scenes and behind the scenes photo gallery and wallpapers for your computer.
Each DVD will also include a top trump card exclusive to the DVD.
Buy Merlin series 4 on DVD from Amazon.co.uk, HMV.com and Play.com