Led by ringmaster Dr. Haze, the 'Circus of Horrors' act includes a contortionist, a woman swinging round the stage by her hair, a man
limboing under a pole that is on fire and a sword swallower.
After the performance Holden commented: "It was gruesomely good. All I kept thinking about was your hair. How does it not fall out? With all my extensions that would be me done."
Other strange acts to appear in week five include a theatre company performing a synchronised trolley dance to 'Moon River' and a 27-year-old machine operator pretending to be a flight attendant, accompanied by the sound of Scooch's 'Flying the Flag'.
It was recently revealed that Ronan Parke and Razy Gogonea are the bookmakers' favourites so far to win this year's Britain's Got Talent.
Britain's Got Talent is on ITV1 tonight at 8pm.