The 5 best theories for what caused The Walking Dead's zombie outbreak - DigitalSpy.com

DigitalSpy.com
The 5 best theories for what caused The Walking Dead's zombie outbreak
DigitalSpy.com
One of the biggest mysteries on The Walking Dead is what started the whole thing. What was the actual source of the zombie outbreak that led to the army of walkers that constantly threaten Rick Grimes and his gang? Luckily for us, a whole horde of ...