In this episode, Walter takes an LSD trip and recalls vital missing pieces of the plan to defeat the Observers. Meanwhile, Peter and Olivia trace the mysterious signal from the radio they recovered in the pocket universe to a rural island where a crucial piece of the plan has been concealed.
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Walter took drugs and worked through his long-standing guilt for the death of his former lab assistant.
Observers are featured in this episode.
A banner behind Peter in 'The Human Kind' foreshadows the pixies Walter sees while high in 'Black Blotter'.
Walter's journal in 'Black Blotter' contains drawings of black Labrador Retrievers, foreshadowing the use of one of Massive Dynamic's secret "black labs" in 'Anomaly XB-6783746'.
In "Black Blotter" Walter is haunted by what happened to Carla Warren.