The prequel follows Gibbs' early days at NIS.
From
To
Series stars LL COOL J and Scott Caan.
The Morena Baccarin-led drama got an early renewal.
One Chicago continues to be a hit for NBC.
Everything we know about the future of the show ahead of the Season 12 reunion.
Guests will include Sean Murray, Wilmer Valderrama, Mariel Molino, Daniela Ruah, and more.