“The Voice” “L.A.’s Finest”

(8 p.m., NBC): Rock star Gwen Stefani reclaims her red chair alongside fellow superstar coaches Kelly Clarkson, John Legend and Blake Shelton as they return for Season 19 of this four-time Emmy-winning music competition series. Among the new twists this season, in the Battle Rounds, the four artists that were saved by their individual coaches will not automatically advance in the competition. Instead, they must vie in the first Four-Way Knockout.

(8:15 p.m., FOX): As the past finally catches up with Syd and McKenna (Gabrielle Union, Jessica Alba), they’re forced to pull off a seemingly impossible mission, while also leaving behind no trace of their own involvement, in the new episode “Déjà Vu.” Meanwhile, a ghost from Syd’s past comes back to haunt her, and McKenna gets distracted by Izzy’s (Sophie Reynolds) strange behavior.