The 9-1-1 and 9-1-1: Nashville stars go head to head in a heated showdown during this week’s epic crossover — but behind the scenes, it was nothing but love. In an exclusive interview with Us Weekly, 9-1-1’s Ryan Guzman and 9-1-1: Nashville’s Chris O’Donnell opened up about the surprisingly delightful experience of meshing their two casts into one for a special two-part event. “With 9-1-1: Lone Star, I feel like we were coming into their world. This one felt like we were fully engrossed, and we had a little bit more to play with,” Guzman, 38, who previously made an appearance on 9-1-1’s first...

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