: In the noir world, they are "The Watchers," ominous figures with rayguns that "burn through flesh".

In the episode (Season 2, Episode 20), the usual high-stakes sci-fi of Fringe transforms into a drug-induced noir musical told through the eyes of a grieving Walter Bishop. The Tale of the Glass Heart

For a deep dive into the script or specific lines, you can view the full transcript on Springfield! Springfield! . TV Review: Fringe, Season 2, Episode 20: Brown Betty

: Walter is a master inventor who claims to have created the world’s "good things"—bubblegum, hugs, and rainbows. However, he is physically dying, kept alive only by a chest full of batteries.

(known as Esther in the story) and Olivia also join in the musical numbers.