Episode 16: ... I Lose Myself [HD • UHD]

For a deeper look into the events and character arcs of this season finale, you can watch this review:

The primary antagonist, Martha (also known as the "Filthy Woman"), poisons the group's water supply with antifreeze.

Morgan discovers that ethanol is the antidote to antifreeze poisoning. He saves the group by bringing them a truckload of "Augie’s Ale".