FBI Season 4, Episode 4 Know Thyself Crime Drama IMDB 7.911 Country United States Duration 43 min Air Date 2021-10-12 Actors Missy Peregrym (Maggie Bell) Zeeko Zaki (Omar Adom 'OA' Zidan) John Boyd (Stuart Scola) Katherine Renee Kane (Tiffany Wallace) Shantel VanSanten (Nina Chase) Jeremy Sisto (Jubal Valentine) Alana de la Garza (Isobel Castille) Overview The team hunts for a serial killer who is targeting young, homeless men. Also, Tiffany and Scola don’t see eye to eye on how to handle the case or the difference between partners and co-workers.