Inspired by the Oscar-winning movie, Training Day is a crime thriller that asks: do the ends justify the means? When a young, idealistic police officer goes undercover in the elite Special Investigation Section of the LAPD, he's tasked with spying on his new partner, a seasoned detective who engages in questionable methods. As this rogue cop starts teaching his principled trainee the way of the streets, they form an uneasy alliance that will irrevocably change the course of both their lives.
When Detective Frank Rourke's penchant for operating in gray areas to fight crime raises the suspicion of LAPD brass, the department assigns untarnished cop Kyle Craig to pose as Rourke's trainee and report back on his off-the-book methods.
Kyle is concerned that Frank's rogue tactics will put a kidnapped girl's life at greater risk when a former member of Muammar Gaddafi's Amazonian Guard becomes involved in the deal and ups the stakes for the girl's return.
The rift between Kyle and Frank grows when Kyle refuses to adhere to one of Frank's morally ambiguous rules, but the pair must put aside their differences when they learn the notorious hitman known as "El Cucuy" is targeting members of the Russian mob in Los Angeles.
Deputy Chief Lockhart opens an internal investigation into a past shooting which could cost Frank his badge and freedom, forcing Kyle to help Frank clear his name or risk losing the one man who could help him solve his father's murder.
An investigation into weapons trafficking becomes personal for Tommy when an old friend becomes connected to the case. Also, Lockhart demands to see results from Kyle's investigation into Frank's actions, leading Frank to reveal surprising information to his trainee.