 UFC 12 was the first UFC event to feature weight classes; heavyweights (200 lb and over) and lightweights (199 lb and under) battled in two separate mini tournaments, each consisting of two semifinal bouts and a finals match.The event also featured a Superfight between Dan Severn and Mark Coleman.The fight would unify the UFC Superfight Championship with the UFC tournament championship and determine the first ever UFC Heavyweight Champion.