https://www.youtube.com/watch?v=6qEy9fXiecQ
It's been the stuff of Sci-Fi entertainment for quite a while.
https://en.wikipedia.org/wiki/Fringe_(TV_series)#Parallel_universe
https://fringe.fandom.com/wiki/Alternate_Universe
https://en.wikipedia.org/wiki/Mythology_of_Fringe#The_parallel_universe
https://screenrant.com/fringe-reboot-parallel-universe-setup-original-cast/