Glenn Rhee (TV Series)

"Guts"
In the TV Series, rather then go into Atlanta alone. He brings more people with him to scavenge for supplies (though he later comes to regret the idea since this was the first time he did it. And the results were not as favorable as working alone.) He spots Rick as he attacked by a mob of zombies upon entering the city and see him escape into a tank parked in the middle of the street. Glenn manages to reach him through the CB in the tank and helps him escape the zombie mob. He then later leads Rick to his group as they try to think of what do next since the zombies are aware of their presence (due to Rick's earlier action. Though he was unaware there were survivors). At first the group think they can escape through the sewer, but Glenn scouting it reveal bars blocking their way and a zombie feasting on a rat. After telling the others that idea out, Rick gets the idea to put zombie entrails on their person to mask their scent and wade through the zombies to get transportation. Glenn volunteers to go with him and the two make their way to a parking lot. The plan works till a sudden rainstorm passes through and washes off the entrails, giving the two away. Rick and Glen are forced to run but manage to make it to the lot and secure a loading truck. Realizing they need a distraction, Rick hot-wires a sports car and has Glenn lead the zombies away from the store while Rick picks up the others. The plan succeeds and Glenn is seen leaving Atlanta in the sport car, wooping in victory.

"Tell It to the Frogs"
Glenn is asked by Rick to go with him back in the city because he knows his way in and out. He leads Rick, T-Dog, and Daryl to the building that Merle was hand-cuffed onto. Heading up the stairs they find no walkers. On the roof, Daryl calls out to Merle, but they only find Merle's hand, a bloody hacksaw, and the bloody hand-cuffs.

"Vatos"
When Rick decides to go back for Merle he enlists the help of Glenn because of his knowledge of the city. Glenn reluctantly agrees and joins the party to go save Merle. In the city, they realize that Merle was able to escape by cutting off his hand and after following Merle's bloody trail the group starts to organize how to get the bag of guns back. Glenn organizes the plan to get the guns like a skilled tactician arguing that he's agile enough to get in and out of the streets. At one point Daryl asks Glenn what his profession was before the apocalypse to which Glenn replies, "Pizza delivery. Why?"

In a scuffle with a gang who was also trying to retrieve the bag of guns, Glenn is taken hostage. When Rick and Daryl come back to try and negotiate a trade, Glenn is shown on the roof tied and gagged. After coming back, it is revealed that there is an entire group of survivors in the building and Glenn is fine.