Engine Publishing (enginepublishing.com)
The Forgotten Bananas
That said, talking about suspension of disbelief you do have a point that the 2nd edition is way more crazy. I like it, because it means there are lots and lots more options and possibilities. But yeah, stuff like crazy scientist fighting against you and super-powered zombies feel a bit out-of-place in a "gritty" survival game.
The first edition is 100 % included in the 2nd edition, so there is really no reason to buy the first one anymore.
Thanks! That's exactly what I was curious about.