Two things makeThe Rookiestand out from other procedurals on network TV. First, there's its title; the titular "rookie," John Nolan (Nathan Fillion), is 45 years old (and based on a real-life story). The second is the cast; in addition to Fillion, the main cast includes plenty of talented actors, including Melissa O'Neil as Nolan's fellow officer, Lucy Chen. Lucy's character arc throughout The Rookie has been pretty compelling. But before the ABC series, O'Neil wound up playing another complex, compelling character in the SyFy series Dark Matter — not to be confused with Apple TV+'s sci-fi series of the same name — and her performance is just one of the many things that make it a standout in the science fiction genre.