Fall TV 2011 Returning Shows: What to expect

(CBS)
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'Blue Bloods' (CBS)

Premieres: Friday, Sept. 23 at 10 p.m.

Expect to see: A new mayor-elect (David Ramsey) means new political challenges for Frank Reagan (Tom Selleck) -- including a case Danny (Donnie Wahlberg) is assigned to in the season premiere. Singers Tony Bennett and Carrie Underwood play themselves in the premiere. Jamie (Will Estes) will get a new partner ("Lie to Me's" Monica Raymund) in episode 2.

-- Rick Porter, Zap2it