Much as Firefly’s vocal fanbase is probably loath to admit, star Nathan Fillion ended up spending far more time busting criminals on eight seasons of ABC’s long-running police procedural Castle than he ever did rustling cattle in space. (169 hour-long episodes more, to be exact.) And while Castle closed up shop last year in a flurry of contract renewal problems, it sounds like Fillion is pretty comfortable in his ABC cop show niche; Variety reports that the network has just given a series order to The Rookie, a new Fillion-starring cop series from Castle producer Alexi Hawley.