‘The Rookie’ cast — Nathan Fillion (John Nolan), Jenna Dewan (Bailey Nune), Eric Winter (Tim Bradford), Alyssa Diaz (Angela Lopez), Melissa O’Neil (Lucy Chen) and more — promises ‘explosive’ drama for season 8, airing Tuesdays on ABC and streaming next day on Hulu and Disney+. Dewan, speaking with ET’s Deidre Behar on set, reveals the ‘storylines get bigger and better.’