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. Meanwhile, Brian learns a new job skill.

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.

After observing the respect that Theresa receives on the job, Johnny gets the guys to revive an old program in order to get a little respect for EMTs.