Heres a trailer. It contains massive series 4 spoilers so watch at your own risk. Actually if you haven't seen the fourth series it's probably better you stay out altogether. YouTube - Dexter Season 5 Trailer (Comic Con)‎ I'm so excited for this, the trailer really pumped me up. It looks like Dex hasn't lost his touch. I thought series 4 was way better than 3 I just hope season 5 can keep that sort of momentum. Who else is eagerly awaiting the return of the serial killer with a heart?