KJ Apa on THOSE Mr. Fantasy Rumors and Nailing Jimmy Stewart’s Accent (Exclusive)

KJ Apa chats with ET's Nischelle Turner at CinemaCon in Las Vegas about Mr. Fantasy and his film, 'Jimmy,' in theaters on Nov. 6. The 28-year-old actor reacts to fan theories that his musical alter ego is Mr. Fantasy and shares what he thinks of the over-the-top singer. Plus, KJ breaks down how he got into character to play actor James Stewart and how he nailed his transatlantic accent. He also react to 'Riverdale' co-star Camila Mendes saying fans should 'skip' season 6 if they're doing a rewatch and shares which seasons of the teen drama he likes the most. More from Entertainment Tonight:    / @entertainmenttonight   Exclusives from #EntertainmentTonight :    • NEW From Entertainment Tonight