'Chicago Fire' Season 3 Episode 3 Spoilers: Focus on Making Adjustments

Entitled "Apologies are Dangerous," the fourth episode of the third of "Chicago Fire" will air Tuesday following significant changes with the Firehouse 51 crew.

The next episode's summary teased that "Mills must come to terms with a future that doesn't include the squad." Although Peter was diagnosed to have vertigo in the third episode, he will not be able to resist on performing his duties as a firefighter.

Meanwhile, Peter's character will not be the only one making adjustments in the next episode as Gaby, Lieutenant Casey's fiancé, will also be starting her new role as a firefighter candidate. The couple will quickly realize how tough it is to balance their professional and personal lives.

The series' promotional video also teased the storyline of Taylor Kinney's character, Kelly Severide, which will be featured in the upcoming episode. The given summary mentioned that "Severide will confront his demons in an unexpected way."

Kelly is still in grief after his best friend's death but he will be involved in a train shooting in the fourth episode.

Many new characters were introduced in the third season of the series namely: Gabriela Dawson, Leslie Elizabeth Shay, Sylvie Brett, Peter Mills, Wallace Booden, Christopher Hermann, Doctor Hallie Thomas, Brian "Otis" Zvonecek and Randy "Mouch" McHolland.

The television series created by Michael Brandt and Derek Haas features the lives of firefighters and paramedics working in Firehouse 51 of the Chicago Fire Department. The show is produced by Dick Wolf and was first aired in October 2012 on NBC.

The fourth episode of "Chicago Fire" Season 3 entitled "Apologies are Dangerous" will be aired on Tuesday at 10 p.m. ET on NBC.