L.A.'s Finest: Cast L.A.'s Finest Drama, Crime, Action 5/13/19 – https://www.spectrumoriginals.com/lasfinest/ GeneralEpisodesCastCharactersGallery Cast See full cast → Duane Martin as Ben Baines Ernie Hudson as Joseph Vaughn Zach Gilford as Ben Walker Ryan McPartlin as Dr. Patrick McKenna Gabrielle Union as Sydney Burnett Jessica Alba as Nancy McKenna Sophie Reynolds as Isabel "Izzy" McKenna Isabel "Izzy" McKenna Isabel "Izzy" McKenna Isabel "Izzy" McKenna