The first responders of 9-1-1: Nashville are about to face their biggest disaster yet when a faceless mystery villain hijacks the city's operations systems. In Us Weekly's exclusive sneak peek of the Thursday, January 8, midseason premiere, titled "You've Been Boarded," 113 firefighter Ryan (Michael Provost), brother Blue (Hunter McVey) and paramedic Roxie (Juani Feliz) attempt to uncover what's causing citizens to suddenly collapse. "Breaths are shallow, he's shutting down on me!" Ryan yells as he tends to a man passed out on the floor.