I'm getting ready to start a modern setting end of the world game. The first events of the campaign set earth under attack by meteors, similar to "Starship Troopers". The damage is very quickly so devastating that Earth's civilizations are heavily disrupted and/or destroyed. The survivors will find themselves in a world of deadly radiation and environmental threats, roving gangs, and weird, otherworldly invaders (think Mi-Go) who road the asteroids in and/or take advantage of the situation.
Any input that could help me solidify this would be appreciated.
I'd thought of most of that. No magic, tech I'm good with between Pathfinder and Modern Path v 1. I hadn't considered the guns everywhere rule, though. That's a good point. I'll keep it in mind.
Here's a specific storyline issue I'm having. Many of these stories start en medias res. Walking Dead starts with Rick waking up after being in a coma to find the society is basically over. What I'd like to do is start more immediately after the initial event, which means that my initial event needs to be more devastating (society destroyed almost immediately), but not as devastating as an extended nuclear war, which would take years before the campaign could even begin.
Does my "targeted" meteor shower accomplish this?
Don't use Pathfinder - use SpyCraft.
Both are vastly superior versions of the d20 system than 3.5, and SpyCraft specifically is everything that d20 Modern WANTED to be.
Pathfinder is fantastic for Fantasy, Horror, and Steampunk, while SpyCraft is fantastic for modern Action, Sci-Fi, and Dieselpunk.