Without going into any detail about the show or the plot of "Day 4," I'll say that I'm pleasantly surprised at how quickly the new season grabbed me. "Day 3" was the least compelling of all three seasons to date, and I was prepared to drop "24" after the first episode or two this week if I wasn't impressed. Well... I'm impressed.
As far as I can tell, other than these two, all of the characters from the past are just plain gone. I wouldn't be surprised if one or two popped up later in the season, but for now, it's a lot of new faces, including some promising characters. I'm most pleased to see Kim Raver (who I liked on, and miss from, "Third Watch") on the show. William Devane, who's been in a million things but I most liked in "Payback," may be a good addition as the Secretary of Defense, but right now he and Chloe are the weak spots.