Timeline

== Pre-Global Outbreak ==
* Hershel Greene's farm has been in his family for 160 years. Hershel left home at age 15 and didn't return for his father's funeral. He is an alcoholic. He drank heavily at the local bar every night until Maggie was born, and then he quit cold turkey. His first wife, Josephine, bought back his grandfather's pocket watch when he became sober, which he'd pawned long ago to pay for his drinking habits.
* Dale Horvath and his wife, Irma, suffered a miscarriage. Before she lost the baby, Irma spent that Thanksgiving in misery from the meat aversions she was suffering.
* Irma Horvath developed cancer and later succumbed to her disease.
* Daryl and Merle Dixon's mother died in a house fire; at the time, Daryl was old enough to ride a bicycle, and Merle was under 18. When he was under 12 years old, Daryl got lost in the woods and eventually found his own way home.
* Michonne is at school with her friend Jocelyn.
* When he was in high school, Shane Walsh once stole the principal's car at lunch hour and filled it with chicken feed before getting back to school in time to finish his sandwich before the bell rang.
* Rick Grimes and his son, Carl, used to go on walks through the neighborhood when Carl was three years old.
* Andrea's father gave her a gun to protect her and her sister, Amy, as they left for their road trip not long before the outbreak.
* Philip Blake lost his wife in a car accident 18 months before the outbreak started.
* Terminus member Martin used to watch football games with friends on Sundays. He also attended church regularly.
* Glenn had moved to Atlanta where he found employment as a pizza delivery boy. It was during this period where he gained insightful knowledge regarding the city streets and layout.
* Jim lived in Atlanta with his family and he was an auto mechanic specialized in vehicle repair.
* Theodore Douglas played football in college, and was given the nickname 'T-Dog'.
* 131 days before the Global Outbreak, the Wildfire virus begins reanimating corpses. Its existence is unknown to the general public.
== Shootout Day ==
* Rick Grimes and Shane Walsh discuss Rick's family. No mention of zombies. Rick and Shane engage in a shootout. Rick gets shot and passes out. Outside Carl's school, Lori Grimes and her friend, Paula, talk about Lori's relationship with Rick. Shane and Mariana Oliva-Grimes arrives and tells Lori that Rick has been shot and is in the hospital. Lori relays this information to Carl as Shane and Mariana looks on.
== After The Shootout Day ==
* Shane visits Rick in the hospital with flowers. Lori and Carl then visit Rick in the hospital. Carl offers to give Rick blood. Chris and Rosa end up giving blood to him.
== After the Global Outbreak ==
=== Day 0-2 ===
* For 132 days a mysterious virus baffles scientists who try to understand and contain it.
* The Global Outbreak begins.
* Reports of strange occurrences appear in the news as the virus begins its explosive spread.
=== Day 3 ===
* While out on their rounds, Leon Bassett, Shane Walsh, and Mariana Oliva-Grimes each encounter mysterious bites. They bring in people who were sick, bit, or had shot someone in self defense.
* In King County, Georgia, Hannah and her children, Jamie and Billy go for a drive in their SUV and get into a car accident while trying to avoid a mob. Her kids leave the car and go to their father Andrew's house. Hannah eventually makes it to the house where she kills a zombified neighbor. Andrew decides they should try to get to Atlanta for safety, but he killed trying to get keys for a truck. Hannah and the kids try to escape in a rescue helicopter but she is bit. She sacrifices herself so that the children can make it to the helicopter.
=== Day 1-5 ===
* Theodore "T-Dog" Douglas drives his church van to the home of every senior citizen he knew, just in case they needed a ride.
* Andrea and Amy meet Dale in Atlanta.
* As the world begins to fall apart, guards begin to evacuate prisoners at West Georgia Correctional Facility. Two guards are evacuating a group of five prisoners, Tomas, Andrew, Big Tiny, Oscar, and Axel when they get surrounded. The guards take the prisoners inside the cafeteria and lock them in there to stay safe until backup arrives. However, they never return and are presumed dead. The inmates remain locked inside the cafeteria with no way of getting out. 
* Some staff working at the CDC leave the complex to be with their families as the outbreak grips Atlanta.
* Jerry, Tyreese Williams, and his sister, Sasha, hole up in their neighbor Jerry's bunker under the shed in his garden.
* Guillermo hides out in the retirement home that he's the custodian of and cares for the elderly left behind.
=== Day 14 ===
* As law and order break down and infrastructure collapses, Shane visits Rick in the hospital where he witnesses the military shooting infected and non-infected staff members and civilians alike. Mariana in the parking lot is hiding in the car from a walker and the Military. Shane evades capture by the soldiers and leaves Rick and blocks the door with a roll-away bed.
=== Day 15-17 ===
* The military forces stationed in Atlanta and guarding the CDC are overrun. Most of the remaining staff at the facility flee.
* Lori and Carl leave their house with Shane, Rosa, and Mariana to find a refugee camp in Atlanta. They are on a gridlocked highway with Carol, Ed, Minerva, and Sophia Peletier. Shane and Mariana watch as military helicopters napalm bomb Atlanta in a desperate attempt to contain the outbreak. 
* At the same time, as the city falls to the undead, Officer Dawn Lerner and her captain, Hanson, evacuate the patients of Grady Memorial Hospital to Butler Park. Around midnight, they do a final sweep of the hospital as the helicopters begin dropping the napalm bombs on Atlanta, killing all those that have just been evacuated.
* Early the next morning, Father Gabriel Stokes' congregation goes to his church and tries to get inside to hide from walkers. He keeps the doors locked in fear and doesn't want to open while people are begging him to let them in. He listens as they are devoured by walkers.
* Pope and his crew were caught in the middle of a bombing and those that survived became The Reapers.