A spontaneous road trip proves disastrous for Wilfred and Ryan.

Wilfred’s nemesis returns with an offer that rocks Ryan’s world.

A hairy situation puts Wilfred and Ryan’s friendship in jeopardy.

Wilfred muddles Ryan’s plan to introduce Amanda to Jenna.

Unexpected problems arise for Ryan and Wilfred after a traumatic experience.

Ryan is forced to intervene when Wilfred becomes embattled with an unlikely foe.

Ryan has to deal with new problems when Wilfred becomes popular.

When Wilfred comes to the conclusion Ryan is the only beneficiary of their friendship, he denies Ryan any further help.

Ryan learns that life is much more challenging without Wilfred around.

Ryan attempts to discover the truth about Wilfred through self-examination.

Ryan and Wilfred make an extraordinary effort to boost Jenna’s career.

A crisis arises when Ryan ignores Wilfred’s advice.

Just as Ryan finds happiness in his life, Wilfred begs him to sacrifice it for a larger purpose.

Ryan must swallow his pride when Wilfred pursues a new love interest., and Ryan meets a new romantic interest himself

Wilfred persuades Ryan to help him get rid of Jenna’s boyfriend.

Wilfred reveals an extraordinary ability when Ryan takes him to a hospice to volunteer.

Ryan meets someone who questions Ryan’s friendship to Wilfred.

Ryan tries to reconcile with his sister, and Wilfred is in for a shock at doggy day care as a result.

Wilfred tries to find Ryan a human friend.

Ryan gets his wallet back (that’s the good news) when his malevolent, porn-addicted neighbor Spencer shows up. The bad news? Spencer’s looking for answers about who broke into his house….

Wilfred is angry after Ryan tricks him into going to the veterinarian.

Ryan forms a unique connection with his neighbor’s dog after a failed suicide attempt.

Ryan’s resentment of his mother even grows when she moves in and becomes friends with Wilfred.

Ryan has a guilt complex over the death of his childhood dog, and Wilfred, upon learning of it, goes to otherworldly lengths to help Ryan discover the truth about how…

In the Season 3 finale, the team investigates the murder of a single mom who was in contact with Voight’s now-reformed son, who was himself brutally assaulted. Meanwhile, Roman makes…

Lindsay and Halstead respond to a shots fired call and discover one survivor: a young girl. Antonio and Olinsky investigate a “self help” group. Platt makes the case to Crowley…

Burgess gives chase after Roman is wounded by a hooded perp who opened fire on their patrol car and shoots who she thinks is the suspect, but no gun is…

Responding to a call about a suspicious duffel bag at the Chicago Lakefront, Voight is horrified to discover that the bag contains the frigid and unmoving body of a newborn…

When Burgess and Lindsay respond to a call about a stabbing, the assailant turns out to be a kidnapping victim escaping her captor; Ruzek accuses Roman of having feelings for…

While responding to a call of shots fired, Voight, Antonio, Halstead and the team come across a secret battered woman’s shelter and discover the owner has been wounded and a…

Lindsay goes undercover to catch a rogue cop who targets women at casinos. Platt risks her life in a negotiation crisis.

The team investigates a Columbine-like threat at a private school. Atwater seeks out a mentor; Olinsky’s marriage faces a crisis.

Voight arranges for his former cellmate, Eddie Little, to be a CI in an effort to bring down a major cocaine supplier. Burgess makes a major move regarding her relationship…

The team investigates a band of rogue operatives.

Intelligence hunts down a crew responsible for a rape and robbery rampage. Lindsay is abducted on an undercover operation.

Ruzek’s job is on the line after an ill-fated undercover op.

Intelligence investigates a doctor who gave his patients lethal doses of chemotherapy. Roman fights a wrongful shooting investigation. The crossover starts on Chicago Fire S04E10 The Beating Heart (I) and…

Voight seeks revenge on the man who tried to kill him. A rumor causes a rift in Intelligence.

Retired Commander Perry enlists Voight and the team to help extract his cop nephew from a unit of corrupt officers who are robbing drug dealers. When things go bad Voight…

The team is terrorized by a gun-wielding father who is desperate to find his missing daughter. Bunny stirs up accusations of misconduct from Voight’s past.