The musical is based on the story of a boy band and uses songs from Take That's discography.
The band, comprised of Gary Barlow, Mark Owen, and Howard Donald, took to the stage after the musical ended at Manchester's Opera House to surprise their fans with an exclusive performance alongside the cast of the show, reported Contactmusic.
The trio performed a special rendition of the show's finale segment, which combines the tracks "Hold Up A Light", "Never Forget" and "Shine".
The crowd thought the show was over until actor Andy Williams called for a re-do of the tracks, only for Owen to walk on stage to rapturous applause. He was followed by Barlow and Donald, who had the whole audience on their feet singing along to the classic tracks.