You can play the game offline, but there are several things you need to do first: Install MW3 via disc or download. If you're using a disc, you'll be prompted to download a 70+GB patch.
Yes, you can play both the campaign mode and multiplayer mode in Call of Duty: Modern Warfare 3 offline. The campaign mode can be played in its entirety in offline mode, and a Private Multiplayer mode allows you to access all of the maps and modes present in Multiplayer.
As the beating heart of Supernatural, Jensen Ackles and Jared Padalecki enjoy a constant presence, but there's one episode Dean Winchester skips. There's no Supernatural without Sam and Dean Winchester... apart from that one time.
In 2005, he was cast as the older brother Dean Winchester on Supernatural, and has starred in all the episodes till date, up to it's final 15th season. He has also directed an episode of the sixth season, Weekend at Bobby's and one of the seventh season, The Girl Next Door, as well as season eight's Heartache.