Day Zero - Episode 1x5 - "Memoriam"

Russell reflects on how he met Kat Finch sometime after Day Zero.

Day Zero

The Earth has been mostly destroyed as a result of World War IV (Day Zero). Radiation and fallout from the global attacks affected most of those who survived, regressing them into a primitive-like state. The fairly scattered, infected "Hybrids" hunted down and killed nearly all of the remaining unaffected humans. A group of survivors in Utah are left to fend for themselves against both Humans and Hybrids.