The first 3 chapters of Part A focused on the time Peter spent inside The Machine. It serves to bridge the Season Three finale with the Season Four premiere by explaining what happened to Peter and what he witnessed/experienced inside The Machine. In addition to this, these chapters were penned by Joshua Jackson. The B series takes place in alternate universes within the Fringe multiverse, instead exploring "What-If's." They do not relate to the two universes that are shown on the television series. There were twelve individual chapters in the Beyond the Fringe series.