Just one, but its scary enough, at least for Nancy, who is in a very dark place, Jonathan frantically searching for her. Also, the boys try to find Eleven, and Hopper and Joyce try to find the truth behind the organization directed by Dr. Brenner.
This is another strong episode for this first season of "Stranger Things". It still gets a zero for originality, and some plot developments (bullies, bullies) could have been just left out, because they just add a strange layer of angst that the show could do without, on top of just answering violence with humiliation and more violence.
Nevertheless, the episode is a strong one. The relationships have been well developed and the dynamics between the characters are good, or, in some instances, great. The production values and the direction are also good, and the atmosphere is pervasive, with a feeling of dread that keeps the viewer's attention during the whole running time (not very scary, but atmospheric enough).
And so close to the end, the pace is gaining some rhythm, which is something that gives energy to the proceedings, helping the episode to end in a high note.