While Brian has his first day on the rig, Johnny runs into Theresa for the first time since they took "a break," and Hank and the guys discuss their "In Case of Emergency" contacts.

A patient pleads with the guys to back to his house and "clear history" on his computer. After stumbling across a troubling image on the computer the guys can't get it out of their heads.

After losing a man that reminds Johnny of his estranged father, Johnny decides to reconnect. Meanwhile, Brian is touched by the dying man's last words and is determined to delivery them in person.

After a drunken booty call at Johnny's place, Theresa suggests that they start a regular, no strings attached, intimate relationship. His colleagues encourage him to enjoy it.

Johnny introduces Theresa to his father and is taken by surprise when his Dad drops a bomb of a secret on him. Elsewhere, Brian struggles to find the right moves to put on his work crush.

Johnny steps up for his friend when Hank gets an invitation to his ex's wedding, while Theresa has trouble seeing eye to eye with a wedding guest and Brian learns a new job skill.

After it's revealed that Hank is deathly afraid of spiders and Brian comes face-to-face with his suicidal doppleganger, everyone examines their own fears, and Johnny gets payback for all the practical jokes he's played.

While teaching a class to prospective EMTs, the crew recalls a day that ran the gamut from the mundane to the catastrophic, and Johnny tries to find out who ate last the donut.

After a close call on the job, Theresa decides to move to Washington and work for the FBI. The only way Johnny thinks he can convince her to stay in Chicago is by proposing to her.