Newly employed as an FBI Special Agent, Cullen finds that the job is not what he expected, while Officers Tolbeck and Reinhardt’s bond grows at the SDPD. Dirk and Sue…

Season finale. After losing yet another key witness in the Las Hormigas Cartel investigation, Cullen is forced to deal with the consequences… and FBI agent Dustin Kasprowicz. Janice returns to…

Dr. Brenner holds Hopper and Joyce for questioning while the boys wait with Eleven in the gym. Back at Will’s, Nancy and Jonathan prepare for battle.

Eleven struggles to reach Will, while Lucas warns that “the bad men are coming.” Nancy and Jonathan show the police what Jonathan caught on camera.

A frantic Jonathan looks for Nancy in the darkness, but Steve’s looking for her, too. Hopper and Joyce uncover the truth about the lab’s experiments.

On his way home from a friend’s house, young Will sees something terrifying. Nearby, a sinister secret lurks in the depths of a government lab.

Lucas, Mike and Dustin try to talk to the girl they found in the woods. Hopper questions an anxious Joyce about an unsettling phone call.

An increasingly concerned Nancy looks for Barb and finds out what Jonathan’s been up to. Joyce is convinced Will is trying to talk to her.

Refusing to believe Will is dead, Joyce tries to connect with her son. The boys give Eleven a makeover. Nancy and Jonathan form an unlikely alliance.

Hopper breaks into the lab while Nancy and Jonathan confront the force that took Will. The boys ask Mr. Clarke how to travel to another dimension.

The interim chief makes a tactical error during an apartment fire, stirring up tensions and putting careers in jeopardy. Meanwhile, Mouch discovers that his donation to a fertility clinic has…

Severide lobbies Chief Boden for a favor for Scott Rice, an old friend needing a second chance with the CFD, but Casey and Otis have their doubts. Elsewhere, Mills works…