AMC today put out the first photo from The Walking Dead Season 4. Here’s a look at Andrew Lincoln as Rick Grimes back to work on the set in Atlanta. But who is that standing in the shadows? Production on Season 4 began Monday. The Walking Dead‘s Season 3 finale drew 12.4 million viewers, up by more than 3 million from the Season 2 ender. And the Season 3 average in adults 18-49 surpassed everything else on TV this season, including The Big Bang Theory, American Idol, The Voice and Modern Family. Season 4 of The Walking Dead begins airing on AMC in October.