Maybe not the most exciting episode but it really advanced the plot.
Introduced the season's big villain and how his group of guys go back to childhood with each other.
Dexter, for the first time, has a partner. I don't count Prado because he was just using Dexter to learn from.
After tonight's episode I wouldn't be surprised if a romantic relationship starts between Dexter and Lumen. After all, she's damaged like Rita was when he first met her. But with Lumen, Dexter can be open about who he is and not hide his dark passenger.
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