This weekend, the MCM Comin Con is running in London at Royal Victoria Dock.
London Go went to see what possesses grown men and women to spend a weekend dressed up as and pretending to be their favourite comic book character. The answer turns out to be suprisingly simple: it's an awful lot of fun.
The Riddler explains why Comic Con benefits many who attend in their day to day life, and sets Dan Freedman some tricky riddles.
Dan also met Gary Burns, the London Comic Con organiser.
Comic Con also welcome familes - as this steampunk take on Gotham shows.