Mysterio's Carnival of Mysteries and Illusions was a traveling carnival in the 19th century in an alternate reality. That reality's Harry Osborn and Quentin Beck were the owners of the carnival.
History[]
Mysterio's Carnival of Mysteries and Illusions was started by Quentin Beck and Harry Osborn.
For theatrics during their shows, Harry and Beck created costumed identities. Harry became the Green Goblin and Beck became Mysterio.
The carnival came to London during the same time Spider-Man had traveled to that dimension to look for Mary Jane Watson who had been lost in limbo.
When Spider-Man saw Green Goblin, he assumed it was Norman Osborn and attacked him. He also fought Mysterio. However, Spider-Man soon learned that that Mysterio and Green Goblin were native to that dimension, not the ones that he knew, and that they were only advertising their carnival.
Later, Mysterio and Green Goblin helped Spider-Man rescue Mary Jane from Carnage.