Description: French stuntmen Cascade wow with a martial arts group performance so action-packed it could put Bruce Lee to shame. But will BGT Judges David Walliams, Carmen Electra, Simon Cowell and Alesha Dixon be floored by their talent? See more from Britain's Got Talent here: http://itv.com/talent http://twitter.com/gottalent http://twitter.com/CascadeDemoTeam http://www.facebook.com/BritainsGotTalent