In the series premiere, “Derailed,” Connor’s commute to work takes a turn. He leaps into action during an accident on his train, and he even treats his own injuries once he arrives at the hospital.
Connor’s Goodbye to Downey
Connor’s first mentor was Dr. Downey (Gregg Henry), but in the Season 1 finale, he died from liver cancer. As a doctor, Downey knew what was coming for him, and he told Connor he’d rather not go through it.
As the Season 1 finale ends, Connor brings Downey’s ashes to Hawaii to say goodbye.
Connor Breaks into Chicago Med
When the hospital goes into lockdown in Season 3 Episode 14 to find a missing baby, Dr. Choi (Brian Tee) needs a cardiothoracic surgeon, so Connor must find a way in — by going through a secret tunnel and breaking in to make it to the ED.
Connor Saves Conjoined Twins
Connor disagrees with the other doctors on a case involving separating conjoined twins; doing so would kill the one with heart failure. However, he’s able to separate and save both babies.
Connor Creates the Hybrid OR
After losing a patient in transport in the Season 4 premiere, Connor comes up with a solution to keep that from happening again: a hybrid OR in the ED, where he can perform necessary procedures on patients.
Chicago P.D. begins with Antonio suffering. First, his partner dies. Then, his son is kidnapped, and he has Voight (Jason Beghe) in his ear offering a darker way of finding him.
The fact that Antonio emerges from the first two episodes of the series and doesn’t go down a similar path as Voight is a sign of who he is.
Antonio Returns to Intelligence
Antonio briefly leaves Chicago P.D. for Chicago Justice, but after the latter is cancelled, he returns to where he belongs and pretty much fits right back in seamlessly.
Antonio Is the Voice of Reason
The Intelligence Unit doesn’t shy away from doing what is necessary to get the job done, but more often than not, Antonio is the one there to remind the others, especially Voight, that they do have to follow the law.
He does that in the Season 6 premiere when he refuses to say he saw something he didn’t when his boss is under fire for what happened to Olinksy’s killer.
Antonio Lashes Out at His Daughter’s Kidnapper
It’s a dark moment, yes, but it’s one that shows that Antonio is just as flawed as the rest of Intelligence.
He reacts in a very human, very non-Antonio (but very Voight) way when he confronts the man who kidnapped his daughter. He pushes him through a window to his death, in a move that results in the rest of the team covering for him.
Antonio Gets Clean
Early in Season 6, Antonio becomes addicted to painkillers, leading him to illegally purchase the drugs. This has a dark ending — his daughter is kidnapped — but Antonio comes out the other side, clean and able to return to work.