As “It’s Not For Everyone” begins, Dr. Ephraim “Eph” Goodweather (Corey Stoll) and Dr. Nora Martinez (Mia Maestro) slice open the remains of one of the four survivors, Captain Redfern (Jonathan Potts) and what they discover is startling—not to mention disgusting. Remember we saw Eph and Nora get an up close look at the anatomy of a vampire in “Gone Smooth” last week. The Strain does a magnificent job of creating this world where vampires exist, yet are so profoundly different from anything we’ve seen on television or even on the big screen.