Strangers Thing Wormhole Explained - Upside Down, Vecna, Abyss

Stranger Things Upside Down Wormhole Explained! What is the Upside Down? What is the other world known as The Abyss? Marcel asks... Hey Colton I’m loving Stranger Things season 5 and I'm very excited for the finale, but I must admit that I’m a little confused by the upside down still and this whole wormhole to another planet reveal. Can you explain?”