Eugene reveals the true nature of his role in the group. Since we don't read the comics. We were really not 100% sure of Eugene's magical cure. But we were holding out some hope. So was the rest of the group.
We also got some much needed back-story to Abraham and how he became attached to Eugene. It's not explained clearly in the show, but we learn that Abraham ends up killing some people he thought he could trust because they raped his wife.
This episode is worth a re-watch after Eugene's revelation. Many scenes with Eugene take on a different light with that in mind.
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