CBS is expanding its Thursday night comedy block, which is spearheaded by The Big Bang Theory and has been in place since the 2010/11 season, to two hours this Fall, the network announced yesterday at its Upfront presentation.

In the newly expanded comedy block The Big Bang Theory remains in its 8/7c slot. The Millers, a new multi-camera sitcom starring Will Arnett, is scheduled at 8:30/7:30c with a new single-camera workplace comedy starring Robin Williams and Sarah Michelle Gellar, The Crazy Ones, at 9/8c. Two and a Half Men moves back an hour to 9:30/8:30c to round out the comedy block. The drama series Elementary finishes the night staying in its current 10/9c time slot. To learn more about the two new Thursday night sitcoms, check out the show synopses below.

The Millers stars Will Arnett as Nathan Miller, a recently divorced local roving news reporter looking forward to living the singles' life until his parents' marital problems unexpectedly derail his plans. After Nathan finally breaks the news of his divorce to his parents, Carol (Margo Martindale) and Tom (Beau Bridges), his father is inspired to follow suit and stuns the family when he leaves his wife of 43 years. Already in shock, Jack is even more aghast when his meddlesome mom decides to move in with him. Meanwhile, his absent-minded dad imposes upon Nathan's sister, Debbie, her husband Adam and their daughter Mykayla (Eve Moon). Nathan's best friend and news cameraman, Ray (JB Smoove), was excited to be Nathan's wingman in the dating scene, but Carol manages to even cramp his style. Now, as Nathan and his sister settle in with their truly impossible parents, they both wonder just how long the aggravating adjustment period is going to last. Greg Garcia (Raising Hope and My Name is Earl) is the executive producer of The Millers for CBS Television Studios. Emmy Award winner James Burrows directed the pilot.

Academy Award winner Robin Williams returns to series television in The Crazy Ones, a single-camera workplace comedy about a larger-than-life advertising genius whose unorthodox methods and unpredictable behavior would get him fired... if he weren't the boss. Simon Roberts (Williams) is the head of a powerful agency, with the biggest clients and brands in the world, but even more important to him is that his daughter Sydney (Sarah Michelle Gellar) is by his side. As his partner, Sydney is Simon's exact opposite - focused, organized and eager to make a name for herself, but also too busy parenting her father, which she'd resent if he wasn't so brilliant at what he does. Joining them in the firm are the dashing and talented Zach (James Wolk); art director Andrew (Hamish Linklater), who's as hard-working as he is neurotic; and the beautiful and deceptively smart assistant Lauren (Amanda Setton). With his team and his daughter behind him, Simon continues to set the advertising world on fire, and it looks like they are definitely buying what these crazy ones are selling. Emmy and Golden Globe Award winner David E. Kelley (Ally McBeal and The Practice), Bill D'Elia, Emmy Award winner Jason Winer (Modern Family), Dean Lorey, John Montgomery and Mark Teitelbaum are executive producers for Twentieth Century Fox Television. Jason Winer directed the pilot.