|Season 4, Episode 7|
|Air Date||August 27, 2017|
|Release Date||August 27, 2017|
|Post Date||August 27, 2017|
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| Corey Stoll as Ephraim Goodweather|
David Bradley as Abraham Setrakian
His health failing, Setrakian ignores Eph's warnings, pushing himself to the limit in his quest for victory and revenge. Fet and Quinlan race back to Manhattan, while the Master seals off the city and prepares to eliminate them all.
- Ouroboros is a reference to a Greek Legend of a snake eating its own tail
- The song that played during the introduction is called "Paint it Black", by the Rolling Stones
- Afib or Atrial fibrillation a quivering or irregular heartbeat (arrhythmia) that can lead to blood clots, stroke, heart failure and other heart-related complications.
- A stroke can be one of two types, hemorrhagic -- which is the loss of blood, or ischemic -- blood is being blocked from flowing