Halloween season is upon us, and RuPaul's search for the UK's Next Drag Race Superstar gets even scarier this week as the iconic Girl Group Challenge takes on a fiendish twist.The queens split into two spiky ‘Ghoul' groups to show off their performance skills and serve up a spooktacular Halloween monster smash hit.Tasked with writing and recording their own lyrics while delivering the best Ghoul Group moves, one question remains: which spine-chilling group will impress Mama Ru enough to claim the Halloween number one spot?In this star-studded fright night, singer Alexandra Burke drops in to give the queens a masterclass on vocals, while pop star Mabel joins the judging panel for a howling good time with the queen of queens, RuPaul, alongside Michelle Visage and Graham Norton.You go, ghouls ! And may the best drag queen win!