Nathan Fillion John Nolan Actor, Executive Producer Alyssa Diaz Angela Lopez Actor Richard T. Jones Sergeant Wade Grey Actor Titus Makin Jr. Jackson West Actor Melissa O'Neil Lucy Chen Actor Eric Winter Tim Bradford Actor Brent Huff Officer Smitty Guest Star Harold Perrineau Pablo Armstrong Guest Star Ali Larter Dr. Grace Sawyer Guest Star Alexi Hawley Executive Producer Mark Gordon Executive Producer Michelle Chapman Executive Producer Jon Steinberg Executive Producer Bill Norcross Executive Producer Terence Paul Winter Executive Producer Rob Bowman Executive Producer, Director Fredrick Kotto Writer