In this episode, the Fringe team investigates a bizarre phenomenon when 15 people up and down the Eastern Seaboard all suffer retrograde amnesia from listening to their shortwave radios on the same frequency. Much to Walter's dismay, Peter presses on with piecing together the doomsday device. Just as Fauxlivia and Peter's chemistry deepens, the anticipation of Olivia's return escalates.
Synopsis provided by the Fandom Wiki, Fringepedia, and Wikipedia.
This episode's glyphs spell:
The Observer can be seen standing in the crowd at the crime scene after Fauxlivia killed the Shapeshifter and threw him out of his apartment window.
The Franklin St. Station subway sign in 'Amber 31422' shows the numbers 6-9-5-5, foreshadowing the radio station frequency investigated in '6955 kHz'.
The skull and crossbones chatroom icon in "6955 kHz" foreshadows the abduction of Max, who had a skull and crossbones flag in his room, in "The Abducted." Also, the chatroom's emphasis on the word "TEAMWORK" foreshadows the reveal that the child abductions are actually the work of two men, not just one.
In "The Day We Died" Peter explained that the Fringe team from 2026 sent the pieces of The Machine to the past, explaining how there could be technology broadcasting radio signals before the radio was invented.
