Los Angeles alum Chris O'Donnell. The actor plays Captain Don Sharpe, the captain of Nashville's busiest firehouse, who serves alongside his son. This casting is quite similar to the leads of the previous 9-1-1 shows,

The “NCIS: Los Angeles” actor joins the ABC series as Captain Don Sharpe, who is described as “a rugged fire captain and rodeo rider who runs Nashville’s busiest firehouse with his beloved son,” according to official character description. While Don is described as a “devoted husband and family man,” “he has his secrets,” the description teases.