I love it!!! Okay, here's one for you. Bree from Desperate Housewives (I love that show) joins CTU as an under cover agent (there is an episode where Bree unexpectedly fires a shotgun out the window to get a creep off her lawn). Bree could be the next Chloe.
Or how about terrorists are hiding on Wisteria Lane and Chloe has a shootout in the middle of the street. Gaby and Susan are seen running for their lives.
Just for good measure lets throw one like sleeper cell into the middle of it.