28 Years Later brought the franchise back after around two decades, but added some very significant developments, including new and scarier variants of the zombies like the Alphas and the Slow-Lows.

The late, late sequel to 28 Days Later, 28 Years Later, is here, and it has significantly expanded on the established lore by adding some exceptional elements, including the Alpha Zombies.

Grebey is a contributor for TIME. Clockwise from Top Left: 28 Days Later, Night of the Living Dead, Evil Dead II, Resident Evil, Shaun of the Dead, Dawn of the Dead Clockwise from Top Left: 28 Days ...