Justice League: The Flashpoint Paradox
 

I watched this earlier and I thought it was pretty great, the trailer doesn't do it justice though. It's got an interesting story and don't let the animation fool you, it isn't a film for kids, it's got a very dark and mature story and it's surprisingly violent, seriously it's completely over the top, even Lois Lane racks up a body count. The only things I wasn't fond of were the constant (and ultimately pointless) cameos and the fact that the story gets a little muddled by the end.

Aside from that though I really enjoyed it.