BBC America are currently showing British fantasy drama series Merlin from the very beginning as part of their Supernatural Saturday line-up.

Back-to-back episodes of Merlin will air on Saturday nights at 9pm.

> Buy the Complete Series 4 boxset on Amazon.

Watch the trailer for BBC America's Merlin marathon...

> Visit BBC America's official Merlin website.

Which series of Merlin is your favourite? Let us know below...