Listen to the sound clip It's big as the Prime Walker killer. They should be able to take those guys out when they come around the corner of the RV. from Lee (Episode 1) - The Walking Dead: Season 1 - Characters (PC - Computer):

It's big as the Prime Walker killer. They should be able to take those guys out when they come around the corner of the RV.

This sound is from Lee (Episode 1) - The Walking Dead: Season 1 - Characters (PC - Computer)

Character sounds from the PC / Computer game The Walking Dead: Season 1.