A patient knocking on death's door pleads with the guys to go back to his house and clear the search history on his computer. After they stumble across a troubling image on the computer screen, the guys can’t get it out of their heads. Meanwhile, Johnny remembers that Theresa has his iPad and it contains things that he wishes he could clear.

Theresa has a brush with death on the job and resolves to join the FBI in Washington. When Johnny proposes marriage to keep her in Chicago, they must overcome a series of catastrophes and mishaps to get to the altar.

When the guys save a landlord with a nut allergy, Johnny finds the perfect apartment to share with Theresa, and his relationship with her enters a new "territory." Brian tries to understand his relationship with Voodoo.

The murky relationship between the caregiver and the cared-for is exposed when Johnny encounters an overly grateful patient and Brian agrees to escort an injured young woman to her prom.

Johnny and Hank are horrified when they find out they have to ride along on Brian's first night shift.

A car crash at a firehouse releases an unusual passenger; and Billy accompanies Theresa and Maeve to a sample sale.

A drunken brawl among sports fans reverberates at a family barbecue, where disputes occur over a new gas grill.

Johnny, Theresa, Billy and Maeve begin to play tennis together; Cash helps Hank shop for his mother's birthday gift; Brian rides along with Voodoo and Stats.

In the Season 2 finale, the guys treat a man who fears hospitals. In other events, Brian confronts his fear of moving out; and Johnny has a fear realized when Billy temporarily moves in with him and Theresa.