Nathan Fillion is using his experience with Joss Whedon on Firefly on ABC's The Rookie

Deadline

“I had an experience on Firefly where everybody that worked on that show considered it the bar to which we could compare all of our other jobs," says Fillion, who is also a producer on the series in which he plays a 40-something rookie cop. "That was the benefit of Joss Whedon, who said ‘I want great actors that can make this language sing and I want people I can potentially spend seven years with’ and I benefited from that. I want The Rookie to be similar."