The Fringe Season 5 episode " Black Blotter " (S05E09) centers on internal struggle as he takes LSD to recover memories of a plan to defeat the Observers. Key Plot Summary
: While high, Walter manages to recall the password " black umbrella ," which allows Peter and Olivia to retrieve the Observer child (Michael) from a couple hiding him in a pocket universe. Watch www xrysoi se Fringe S05E09
: Seeking answers hidden in his subconscious, Walter takes a dose of "Black Blotter" acid. This results in surreal, Monty Python-style animations and hallucinations of his late lab partner, Carla Warren. The Fringe Season 5 episode " Black Blotter