When it comes to CBS' FBI, no one is safe from a possible write off - including the special agents who anchor the TV show. Special Agents Maggie Bell (Missy Peregrym) and Omar Adom "OA" Zidan (Zeeko Zaki) as well as ASAC Jubal Valentine (Jeremy Sisto) have been part of the series since its 2018 premiere. However, the original SAC Dana Moiser (Sela Ward) only lasted one season before she was replaced by Isobel Castille (Alana De La Garza). John Boyd joined the cast during season 2 as Special Agent Stuart Scola, and has been on the hunt for the perfect partner ever since.