I don't know where to start with this show, it's just incredible! I've seen it twice and I was on the edge of my seat just as much second time round even though I knew what was coming! The 24 hour concept is done really well, the acting and scripts/stories are done so so well. My favourite season has to be season 5 with my least favourite being 6. All characters from Jack Bauer to George Mason are really well explained and any main character deaths are really emotional and hard hitting. I highly recommend watching this show.