The narrative kicks into high gear when a bioterrorist attack unleashes the "T-Virus" (and a mutated variant of the G-Virus) at Harvardville Airport. What begins as a routine traffic stop inside the terminal rapidly escalates into a full-blown outbreak. As the infected swarm the departure lounges and baggage claim, the airport is locked down by the government.

In the sprawling, often convoluted timeline of the Resident Evil franchise, the year 2008 stands as a pivotal turning point. After the explosive, action-heavy departure of Resident Evil 4 (2005) and before the controversial, co-op focused Resident Evil 5 (2009), fans found themselves in a peculiar limbo. The live-action Paul W.S. Anderson films had veered so far from canon that they were barely recognizable. It was in this void that Capcom and Sony Pictures Entertainment Japan took a bold gamble: the first fully CGI feature film directly tied to the game continuity.

The result was .

Released directly to DVD and Blu-ray on December 30, 2008 (with a limited theatrical run in Japan in October of that year), Degeneration was more than just a visual spectacle; it was a love letter to the zombie roots of the franchise and a crucial narrative bridge. For fans starving for a return to the claustrophobic, biological-horror atmosphere of Raccoon City, this film felt like coming home. Set one year after the events of Resident Evil 4 (2005) and seven years after the destruction of Raccoon City (1998), Degeneration opens not in a creepy mansion or a Spanish village, but in an American airport.