The film opens at the fictional Eagle Peak castle in Hollywood, where evil scientist Victor Gaghan is busy bringing his S Club clones to life. Meanwhile, the real S Club arrive in Barcelona for what should be a quick whirl of media appearances, rehearsals, and a rare chance to unwind after a grueling tour. They soak in a rare moment of leisure, trading stories and smiles, until their manager Alistair vanishes from their hotel, leaving behind only a chilling clue and a growing sense that something isn’t right. The next morning, the band members oversleep and wake to find Alistair missing, his hotel bill unpaid, and a nagging suspicion that their lives have taken a surreal, unsettling turn.
In a reckless move, they decide to pamper themselves rather than settle the bill, only to discover that their tab has drained their funds and that their lookalikes—living, breathing copies of them—are performing on a TV in a nearby cafe. The shock deepens when they learn that Alistair is pulling the strings behind these uncanny doppelgängers. Panicked, the group flees the hotel and heads toward Los Angeles, only to be arrested for trying to escape their bill and for allegedly impersonating S Club. In jail, a lighthearted, dance-loving warden becomes a potential ally as the group solves their predicament with a bold, highly choreographed rendition of one of their hit songs, and a shameless appeal to Natalie for help.
Natalie helps them slip out of the country by disguising them as English football fans so they can dodge Spanish police, and the chase continues as they struggle to reconnect with their doubles. A brutal decision is made: to regain control, they swap out Hannah, Rachel and Jon for their copies during a high-profile music video shoot. The real Hannah, Rachel, and Jon quickly notice the eerie differences in the clones—especially the triplets Bradley, Tina, and Jo who lack belly buttons and are subjected to almost ritualistic routines of repetitive rehearsals, shared showers, and controlled feeding. As the clones settle into a strange, almost cult-like rhythm, Rachel seizes a moment to warn a fan to call for help, only to have Alistair confiscate the evidence and relay the information back to Gaghan.
The trio—Bradley, Tina, and Jo—begin to realize that their friends’ copies are largely unaware of their own duplication, while the originals struggle to understand why their counterparts are suddenly breaking out from the programmed trance. The trio uncover a digital trail that points to Gaghan’s lair and his workplace, and Jo assembles clues that lead back to Eagle Peak, piecing together that Gaghan, once a celebrated genetics professor, was fired for illegal cloning experiments and had recently purchased S Club memorabilia online, including their underwear. When their friends miss a planned meetup, Bradley, Tina, and Jo decide to act, rallying the others to confront the clone makers and reclaim their identities.
A dramatic reckoning follows as the real group converges on Eagle Peak with their living clones, running into the real Hannah, Rachel, and Jon, before Alistair interferes again. The clones reveal the truth to the originals: Gaghan intends to use music to dominate the world because celebrities draw more attention than politicians. In a tense standoff, Alistair (who is revealed to be a clone) attempts to kill them, but the real Alistair knocks the imposter out, turning the tide. Susan Sealove, one of Gaghan’s creations, is exposed and captured, along with the rest of the nefarious scheme, as the group plans their next move.
Inside Eagle Peak’s dining hall, the assembled clones of famous pop icons—alongside the S Club originals—stage a rebellion, encouraged by the courage of the real group. The scene features appearances from cohorts imagined as clones of Angus Young, Elvis Presley, Will Smith as Agent J, Victoria Beckham, Robbie Williams, Eminem, Michael Jackson, Elton John, Madonna, George Michael, Gareth Gates, and Groucho Marx, all urged to reclaim their free will. Enraged, Gaghan triggers a self-destruct sequence that threatens to wipe out everyone on the premises. The united S Club and the clones strike back, singing a defiant anthem, and the Jackson-inspired clone helps halt the destruction, allowing the originals and their impostors to escape.
In the ensuing chaos, the Gates clone—also rescued—appears flirting with Rachel, underscoring the strange, otherworldly mix of fame and duplication that has overtaken Eagle Peak. The final showdown ends with the clones stepping out into the world on their own terms, while the real S Club deliberate how to handle their newly empowered doubles. Alistair, now free of the unlawful control, returns to the side of the group, and Gaghan and Sealove are arrested for their crimes. The band contemplates their busy schedules and the ethical implications of their clones, recognizing that life could be shared or split, as the clones may take breaks in their busy lives—and the real members might use them for a holiday whenever they wish.
On a sunlit beach, the real S Club enjoy a moment of calm, while their clones carry on in the background, ready to step in when the group needs time off. The arrangement—allowing the clones to take their places for holidays and rest—becomes a pragmatic trade-off, a wink at the audience about the power of fame, identity, and consent. The film closes with a playful, if poignant, glance at the Gates clone seen again with Rachel, a reminder of how blurred lines between reality and replication can become when pop culture collides with science.
