On the Season 3 Finale of "NCIS: Los Angeles " (Tue., 9 p.m. EST on CBS) Callen (Chris O'Donnell ) went rogue and faced off against his nemesis, The Chameleon (Christopher Lambert )

With a camera crew present, the villain doubted that Callen had the stones to shoot him "for the whole world to see," but he did just that.

After Callen was pulled in for the shooting, Hetty (Linda Hunt ) quit. (Again.)

Find out what happens next when "NCIS: Los Angeles" Season 4 kicks off in September 2012.

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