"Clear" is the twelfth episode of the third season and 31st episode overall of the post-apocalyptic horror television series "The Walking Dead", which originally aired on AMC in the United States on March 3, 2013.
 The episode was written by Scott M. Gimple and directed by Tricia Brock.
 In this episode, Rick Grimes (Andrew Lincoln), Carl Grimes (Chandler Riggs), and Michonne (Danai Gurira) go on a supply run to Rick's hometown, initially to his old police station, for more weapons for the upcoming battle against The Governor.
 This episode marks the return of Morgan Jones (Lennie James), who was last seen in the series pilot episode, "Days Gone Bye".
"Cherokee Rose" is the fourth episode of the second season and 10th episode overall of the post-apocalyptic horror television series "The Walking Dead", which aired on AMC in the United States on November 6, 2011.
 The episode was written by Evan Reilly and directed by Billy Gierhart.
 In the episode, the group of survivors move to the home of Hershel Greene (Scott Wilson).
 While the group contemplates on what to do, Daryl Dixon (Norman Reedus) continues to search for Sophia Peletier (Madison Lintz).
"Secrets" is the sixth episode of the second season and 12th episode overall of the post-apocalyptic horror television series "The Walking Dead".
 It originally aired on AMC in the United States on November 20, 2011.
 In this episode, Glenn (Steven Yeun) tells Dale Horvath (Jeffrey DeMunn) that Lori Grimes (Sarah Wayne Callies) is pregnant and there are numerous walkers in the Greene barn.
 Dale confronts Hershel Greene (Scott Wilson) about hoarding walkers in his barn.
 Meanwhile, Shane Walsh (Jon Bernthal) attempts to teach Andrea (Laurie Holden) how to use weapons and Lori agonizes over the decision to terminate her pregnancy or keep the baby.
"Pretty Much Dead Already" is the seventh episode and mid-season finale of the second season, and 13th episode overall of the post-apocalyptic horror television series "The Walking Dead".
 It originally aired on AMC in the United States on November 27, 2011.
 In the episode, Glenn (Steven Yeun) reveals to the group that there are walkers in the Greenes' barn, dividing the group on what to do.
 Hershel Greene (Scott Wilson) sets a deadline for the group to leave, unless Rick Grimes (Andrew Lincoln) does a difficult task.
 Meanwhile, Shane Walsh (Jon Bernthal) slowly loses his sanity after many secrets around him are revealed and Carol Peletier begins to question whether her daughter, Sophia will be found.
Beth Greene is a fictional character from the American horror drama television series "The Walking Dead", created by season two showrunner Glen Mazzara, and portrayed by Emily Kinney.
 Daughter of veterinarian and farmer Hershel Greene, and younger, half-sister of Maggie, the character has no counterpart in the comic book series on which the show is based.
Carl Grimes is a fictional character from the comic book series "The Walking Dead" and is portrayed by Chandler Riggs in the American television series of the same name, which airs on AMC in the United States.
 The character was created by writer Robert Kirkman and artist Tony Moore, and debuted in "The Walking Dead" #2 in 2003.
 In both forms of media, Carl is the son of primary protagonist Rick Grimes, and his wife Lori Grimes, and is one of the longest-surviving characters and one of the few original Atlanta survivors still alive.
Hershel Greene is a fictional character in "The Walking Dead" whose role is depicted in the comic book, television series as portrayed by Scott Wilson and the game series.
 He is the widowed owner of a farm in Georgia and has previous experience in the veterinary fields.
 A devout Christian, with uncompromising morals and a stubborn attitude, Hershel remains fiercely protective of his large family, despite his many losses.
 In both the comics and television series, he is initially introduced saving the life of Carl Grimes, the son of Rick Grimes after he is shot by one of Hershel's neighbors, Otis, and becomes the moral center of the group .
Scott Wilson (born March 29, 1942) is an American film and television actor.
 He has more than 50 film credits, including "In the Heat of the Night", "In Cold Blood", "The Great Gatsby", "Dead Man Walking", "Pearl Harbor", and "Junebug".
 In 1980, Wilson received a Golden Globe nomination for Best Supporting Actor – Motion Picture for his role in "The Ninth Configuration".
 He played veterinarian Hershel Greene on the AMC television series "The Walking Dead" from 2011 to 2014.
 He had a recurring role on "" as casino mogul Sam Braun.
"Nebraska" is the eighth episode and mid-season premiere of the second season, and 14th episode overall of the post-apocalyptic horror television series "The Walking Dead".
 It originally aired on AMC in the United States on February 12, 2012.
 In the episode, the survivors deal with the aftermath of the barn shooting, which causes Hershel Greene (Scott Wilson) to order Rick's group to leave and then start drinking and disappear from the group, leading Rick Grimes (Andrew Lincoln) and Glenn (Steven Yeun) to try to find him.
 Meanwhile, Dale Horvath (Jeffrey DeMunn) becomes more suspicious of Shane Walsh's (Jon Bernthal) actions.
Rosita Espinosa is a fictional character from the comic book series "The Walking Dead" and is portrayed by Christian Serratos in the American television series of the same name.
 She accompanies Eugene Porter and Abraham Ford on a mission to Washington, D.C. In the comic book series, she joins Rick Grimes' group after they leave Hershel Greene's farm and go to DC.
 Eventually Eugene is revealed to have lied but they continue onto Washington anyway, since he was still convinced the city would offer greater chance of survival, and they eventually find the Alexandria Safe-Zone.
 Though she and Abraham continue their relationship she eventually breaks up with him when he cheats on her with Holly and moves in with Eugene, eventually starting a relationship with him, but forgives Abraham after he is killed by Dwight.
 Rosita also takes part in the war against the Saviors led by Negan it's conclusion of which sees the 4 communities uniting forces.
 Two years later Rosita and Eugene are married but their relationship is strained.
 Rosita is revealed to be pregnant, but Eugene is not the father.
 She is ultimately killed by Alpha, leader of the Whisperers, along with 11 other key members of all 4 communities.

Question: Hershel Greene a fictional character portrayed by Scott Wilson, saves the life of Chandler Riggs's character in an American television series which airs on what? 
Answer: AMC