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Francis was sexually abused by his older brother and forced to use his mutant powers to help him commit various crimes. Francis eventually killed his brother to prevent him from raping the Black Cat which soon enough led to a misunderstanding with Spider-Man who humiliated and badly hurt Francis. Following his confrontation with Spider-Man, Francis bought Mysterio's costume and equipment from the Kingpin and set out to exact revenge on Spider-Man.


Francis Klum was created by Kevin Smith and Terry Dodson and first appeared in Spider-Man/Black Cat: The Evil That Men Do #1 and became Mysterio in the final issue of the miniseries.

Major Story Arcs

Civil War

After Spider-Man's unmasking to the public, Klum decided to attack the school Peter Parker worked at to get revenge on Spider-Man. Daniel Berkhart, who was also calling himself Mysterio, arrived and allied with Spider-Man to defeat Klum. The two Mysterios were then confronted by a third Mysterio - the demonic spirit of the original Quentin Beck. Francis was critically wounded by Ero, who was infiltrating the school as it's nurse Miss Arrow, who punctured him through the chest with her stingers. Coughing up blood, he teleported to safety. His body was not found.

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