Ep 4. Big Friends, Big Enemies

In Chicago PD season 4 episode 4, titled "Big Friends, Big Enemies," the Intelligence Unit investigates a powerful drug kingpin named "El Pulpo," who is responsible for a recent uptick in drug-related violence in the city. At the same time, Atwater goes undercover to infiltrate a drug ring that is supplying El Pulpo with his product.

The episode begins with a young girl named Clarissa getting shot and killed in a drive-by shooting. The team is immediately on the case, trying to uncover who is behind the senseless violence. After a bit of investigation, they discover that El Pulpo is the one responsible - he has been increasing his drug sales, leading to more violence on the streets.

To try and take El Pulpo down, the team decides to start with his suppliers. Atwater volunteers to go undercover to infiltrate a drug ring that is working with El Pulpo. Although he is hesitant at first, given the dangers of going undercover, Atwater ultimately decides to take on the task.

Meanwhile, Voight and the rest of the Intelligence Unit are working to track down El Pulpo himself. They know he is a difficult target to pursue, as he is well-connected and has deep pockets. They begin by tapping his phones and following his movements, hoping to catch him in the act of making a drug deal.

As Atwater continues to work deep undercover, he begins to develop a personal relationship with one of the men in the drug ring. It becomes clear that Atwater is in a difficult position, as he is tasked with bringing down the very people he has come to know and understand.

The team also faces another challenge in the form of a corrupt cop who is working with El Pulpo to undermine their investigation. This adds an extra layer of difficulty to their efforts to take down the kingpin.

In the end, the team must work together to bring El Pulpo and his network to justice. They uncover some surprising twists and turns along the way, and must always be mindful of the danger that comes with working on a case like this.

Overall, "Big Friends, Big Enemies" is an action-packed and suspenseful episode of Chicago PD that keeps viewers on the edge of their seats. With multiple plot lines, complex characters, and intense action sequences, it is a must-watch for fans of the show.