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'The Big Bang Theory' (CBS)

Premieres: Thursday, Sept. 26 at 8 p.m. Expect to see: When we last saw our favorite nerds, Leonard had left on a scientific expedition at sea, leaving Sheldon in Penny's care. During the special one-hour Season 7 premiere, we'll learn that Sheldon and Penny have shared intimate secrets while Leonard was away. Elsewhere in the group, look for Wolowitz to help Raj get over his devastating break up. -- Billy Nilles, Zap2itCBS