One of the key challenge's AMC's The Walking Dead needed to successfully tackle in order to win over a skeptical audience was to make sure that the zombies overrunning the world in the show were suitably scary. Thanks to a saturation of supernatural shows over the last decade, audiences have become less easy to impress by these traditionally creepy TV favourites, so the show's creators really needed to pull out all the stops to ensure they hit the mark with truly disturbing shuffling corpses. The subject of whether or not the show's plots are on form is always up for debate, with the writers seemingly wasting several opportunities to keep their audience excited, but that's another matter for another time as most will agree that they at least got their walkers right. So whether they're jaw-droppingly gorey, spine-chillingly unsettling or just plain awesome, join us now as we take a look at some of the coolest walkers we've come across through the first four seasons of The Walking Dead.Serious spoilers for those not up to date with the show.