Britain's Got Talent dancers Libby and Charlie revealed they barely had more than a day to put together a routine for the semi-final.
The bubbly duo were on stand-by when they were told they would be filling in for over safety concerns for the content of their act.
Charlie explained that he was on holiday in Greece when he got the call and Libby spoke to him on the phone to tell him to rush back to the UK so they could perfect their performance.
After their energetic routine on Friday night's semi-final which delighted all four judges, host Dec explained that the pair had been on stand-by.
"What people won't realise is that you were a stand-by act and because one act couldn't be in the semi-finals you got called up to fill in. When did you find out you were in the semi-finals?"
Charlie said: "It was about Wednesday. So I was in Greece, not Grease the Musical, but the place. I was asleep on the sunbed."
Libby giggled excitedly: "I was on FaceTime to Charlie like you need to get on that airplane and come home now!"
Libby and Charlie replace the daredevil magic act The Brotherhood after they were forced to withdraw after four months of preparation because producers deemed their last act too dangerous.
The trio are renowned for their daring stunts and performed with samurai swords at their first audition.
A TV source told the Mirror: " The health and safety of all the performers is a huge priority to the show and producers will only allow acts to take part who they are certain are adequately prepared."
In a statement posted to their Instagram , The Brotherhood revealed their disappointment at ITV's decision.
"We've learned to stay humble in the good times and humble in defeat. We've worked for the last 4 months on an act so ambitious and out there that we've put our sanity, blood, sweat, fire and tears on the line," they wrote.
"Through circumstance and bad luck out of our hands sadly we aren't in a position where we can deliver what we set out to do. It kills me that we've failed and that we will no longer be in 2019's @bgt competition.
"We are truly gutted that we won’t get to be in the fight but we aimed for the stars and fell short. It's been an absolutely incredible ride for BGT this year and I wish all the acts still In the competition the best of luck and success and that a magic act can bring home the crown again."
The act also shared three teasers to show fans what they'd planned for their semi-finals performance.
One clip saw one of the masked men with his hands chained and padlocked, with the thick chain binding his wrists together and wrapping around his neck and torso.
The second showed another of the performers standing inside a metal cage as fire shot out at him, appearing to set his cloak alight.
And the third had the last man crouched inside a perspex box filled with water as the other two appeared to seal the top with tools.
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