'How I Met Your Mother' (CBS)

Jason SegelNeil Patrick HarrisAlyson Hannigan
Premieres: Monday, Sept. 19 at 8 p.m. Expect to see: This perennial fav is getting up their in years, but the romantic queries for its core six-some seem greater than ever. A few seasons after their anticlimactic breakup, Robin (Cobie Smulders) seems to be back in love with Barney (Neil Patrick... CBS