Chronology and Timeline Overlays

Series Chronology

Full-series spoilers. This chronology uses outbreak-relative years unless an exact date is directly supported by story material. It is designed as a.

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Series Chronologyseries-chronologySeries Chronologytimeline-overlaysChronology and Timeline OverlaysExtinction Cycle loreExtinction Cycle timeline

Dating conventions

**Outbreak Year 0** is the modern Hemorrhage Virus and Variant outbreak year. Exact dates are included only when story material directly supports them. Otherwise, entries use broad outbreak-relative labels such as early outbreak, mid-outbreak, late first year, reconstruction era, or Dark Age era.

For day-level pages, **April 18, 2015 is Outbreak Day 1**. Building 8 is directly timestamped at 0435 hours on April 19, 2015, which places the entry mission on the supported Day 2 morning sequence rather than making April 19 the start of the outbreak clock.

**Pre-outbreak years** use negative outbreak-relative years. For example, the directly supported July 10, 1968 Operation Burn Bright event is treated as **Outbreak Year -47** because it occurs decades before the modern outbreak.

**Dark Age** begins eight years after the events of [[extinction-war|Extinction War]], when the surviving United States has reorganized as the [[allied-states|Allied States]] and most survivors live inside approximately one hundred outposts.

Quick chronology index

Outbreak Year -47: VX-99 origin and Operation Burn Bright [[extinction-red-line|Extinction Red Line]], [[trevor-brett|Trevor Brett]], [[vx-99|VX-99]]

Outbreak Year -35: Gibson's renewed VX-99 pursuit and Project BESERKR context [[extinction-red-line|Extinction Red Line]], [[rick-gibson|Rick Gibson]], [[medical-corps|Medical Corps]]

Outbreak Year 0, early outbreak: Building 8, Chicago, Atlanta, CDC extraction, Plum Island [[extinction-horizon|Extinction Horizon]], [[team-ghost|Team Ghost]], [[plum-island|Plum Island]]

Outbreak Year 0, mid-outbreak: VariantX9H9, Operation Depletion, New York, Fort Bragg, Operation Liberty [[extinction-edge|Extinction Edge]], [[extinction-age|Extinction Age]], [[operation-liberty|Operation Liberty]]

Outbreak Year -47, exact date supported: July 10, 1968

Operation Burn Bright and the first VX-99 field catastrophe

The earliest confirmed root event in the Extinction Cycle is [[operation-burn-bright|Operation Burn Bright]] in Vietnam. [[trevor-brett|Lieutenant Trevor Brett]] and thirty-one other Marines are inserted by helicopter and ordered to take doses of [[vx-99|VX-99]], a chemical cocktail presented as protection against lingering battlefield agents. The experiment turns the Marines into violent, hyper-sensory killers, producing the first known modern Variant-like soldiers.

The event establishes the foundational pattern of the series: a military program meant to improve warfighters instead creates monsters. Brett survives as the figure later remembered through the [[extinction-red-line|Red Line]] mythology, while [[rick-fern|Rick Fern]] and Brett become missing remnants of a disaster the military tries to erase.

Outbreak Year -35, exact date supported: April 18, 1980

Gibson reopens the Burn Bright problem

Roughly twelve years after Operation Burn Bright, [[rick-gibson|Rick Gibson]] reviews the classified aftermath. The record indicates thirty Marines officially killed in action, with Brett and Fern missing and presumed dead. Gibson recognizes that the retrieval mission was not a true recovery operation, but an evidence-control operation meant to confirm that VX-99 residue and records would not escape into public view.

This period becomes the bridge between Vietnam and Building 8. Gibson's ambition does not die with the failed field test. Instead, he treats the disaster as data.

Pre-outbreak late period

Exact date supported: March 3, 2015, Slate Wiper sample work begins in Guinea

[[chad-roberts|Dr. Chad Roberts]] reaches a WHO field hospital in Guinea to investigate a severe Ebola microbreak connected to the Slate Wiper research chain. This is the virology side of the origin sequence that later intersects with VX-99, Building 8, and the Hemorrhage Virus.

The event matters because the modern catastrophe requires both halves of the origin chain: Ebola as the delivery vehicle and VX-99 as the transformation engine.

Outbreak Year 0, early outbreak

Exact date supported: April 18, 2015, Outbreak Day 1 begins

The modern outbreak clock begins on April 18, 2015. San Nicolas Island and Building 8 move from classified research problem to species-level ignition point, while the infection chain begins moving toward Chicago and Team Ghost is pulled into the emergency from Fort Bragg.

This entry functions as the master day-level anchor for the modern chronology. Later entries may use Day 2, Day 8, Day 16, or other day markers only when those dates are directly supported.

Outbreak Year 0, exact dates supported: April 25 to May 2, 2015, Days 8 to 16

Exact date supported: April 25 to April 26, 2015, Kate accepts the weapon solution

On April 25, Day 8, [[kate-lovato|Kate Lovato]] concludes there is no cure because VX-99 has caused irreversible epigenetic changes. On April 26, Day 9, Kate and [[pat-ellis|Pat Ellis]] test the engineered counter-virus [[variantx9h9|VariantX9H9]] on Patient 14. The test kills the infected subject through catastrophic internal bleeding. Kate immediately understands the scale of what she has made: a weapon that will kill not only millions, but potentially billions of infected humans.

The event saves the species from one version of extinction while creating Kate's defining moral wound.

Outbreak Year 0, mid-outbreak

The Variants survive X9H9 and become the new enemy

New York civilian survivor arc expands through Meg Pratt

Meg's survival in New York bridges the civilian and military arcs. Her firefighting identity, grief over Tim, and later connection to Jed, Rex, Jake, Timothy, and Team Ghost make New York more than a battlefield. It becomes a civilian trauma archive: trapped rooms, boarded windows, rooftop extraction attempts, hidden survivors, tunnels, and ordinary people forced into impossible decisions.