Tom Selleck's role as Frank Reagan in CBS' "Blue Bloods" is a major selling point for the show. His character, the gruff patriarch of the Reagan family known for their ties to law enforcement, is the glue that holds the series together. Selleck's leadership on and off the screen has a significant impact on the show, as acknowledged by co-stars Vanessa Ray and Will Estes. They credit Selleck's talent, dedication, and experience as reasons for the show's success. His influence on "Blue Bloods" is undeniable.