https://fringe.fandom.com/wiki/Massive_Dynamic
https://fringeconnections.com/massive-dynamic
https://en.wikipedia.org/wiki/Mythology_of_Fringe#Massive_Dynamic
https://tvtropes.org/pmwiki/pmwiki.php/Characters/FringeMassiveDynamic
https://www.latimes.com/archives/blogs/show-tracker/story/2009-11-13/fringe-inside-massive-dynamic
Of course the Tracker+TV+series is also about tracking thins down, but there isn't an alternate world aspect in this TV production.
https://thedigitallabyrinth.blogspot.com/search?q=FRINGE+TV+Series
