Subtitle 28 Days Later... -

Followed by 28 Weeks Later (2007) and the upcoming trilogy beginning with 28 Years Later (2025), which explores survival decades after the initial collapse.

, human aggression as a biological force, and the morality of survival in a lawless world. The Legacy & Franchise subtitle 28 Days Later...

The "28 days" refers to the specific timeframe during which the protagonist, Jim, was in a coma following a bicycle accident. Followed by 28 Weeks Later (2007) and the