Question: Rick Grimes is a fictional character and the protagonist in the comic book series "The Walking Dead", Grimes is a small town sheriff's deputy who has a son, Carl Grimes is a fictional character from the comic book series, and is portrayed by Chandler Riggs in the American television series of the same name, which airs on AMC, in which country?
Sentence (from "Rick Grimes"): He awakens from a coma after a life-threatening gun shot wound to find the world overrun by zombies, to which they refer as "walkers".
Relevant evidence: No