'The Walking Dead': Who Could Be Marking W's On The Heads of Walkers?

The Walking Dead is close to its Season 5 finale. With that, we've begun to see several walkers with W's carved into their foreheads. This is a clear sign that another group is out there, and based on those markings, we'd venture to guess they are extremely dangerous.

The big questions right now are: who is this group and what does it intend to do before the end of the season? We have several speculations on the matter, so right now we are going to dig in and see if we can help The Walking Dead fans have some form of insight into what is happening on the borders of Alexandria.

Could the W's be nothing, or could it mean something terrible is on the horizon? Let's jump in.