[quote=@Mae]
[@Kuku4Kuku]Betrayal at House on the Hill is a personal favourite :D Are you thinking of Dead of Winter for the zombie apocalypise one? You have a base and send your guys out to go collect supplies and kill zombies. It's co-operative with a possible traitor... there are lots of zombie apocalypse games but that's the first that comes to mind. 
[/quote]

YES! That one. I've only played it once, but it was really interesting! Only, when we played, my friend got the Traitor cards mixed up with the Non-traitor cards and....though we didn't know it, we were all traitors. It was SO funny when we found out, because she was the only non-traitor. So, everyone at the table was trying to figure out how to get there stuff all while seeming to be cooperative with the group. It was great.