Dizi Adı: Helix
Bölüm Adı: Single Strand
Sezon/Bölüm: 1. Sezon 4. Bölüm
Yayın Tarihi: 24 Oca. 2014

On day 4, the quarantined people on Level R force Dr. Hatake to re-etablish communication by cutting off the air supply. Meanwhile, Peter’s condition worsens quickly, forcing Alan to try the untested universal treatment, Sarah has to question her rapid response test and Doreen gets closer to figuring out Balleseros.