A '90s (and early '00s) nostalgia-fest, it features a handful of groups who made the decade poptastic, made curtain haircuts cool and had kids learning 'Bodyshakin' dance moves across the nation's playgrounds.
Double denim legends B*Witched, Popstars rejects Liberty X, bad boys 5ive, cheeky boy-next-door trio 911, sultry girlband The Honeyz and a Kerry Katona-era Atomic Kitten are all taking part and putting aside their differences to relive their pop heyday.
But this isn't '90s enough for Digital Spy. We've picked out eight other pop acts from the decade that we'd love to see in a second series of Big Reunion:
If you dared call Let Loose a boyband in the '90s you'd get some serious scowls in the school dinner queue. They played their own instruments dammit! In 'Crazy for You' they also had a pretty nifty tune that remains a guilty drunken karaoke classic.
Ziggy who went in that series of Big Brother with Chanelle. Five other blokes who could easily be mistaken for Adam Rickett. A song about finding love on the London Underground. What more could you want from a boyband? The closest we came to love on the Northern Line was finding an unopened tube of Pringles.
An English-Norwegian pop combo, who were genuinely massive for about 12 months. They were technically more of a '00s group, but they started off in 1999, so we're squeezing them in. Come on, 'Caught in the Middle' was a tune!
Haydon Eshun, Jomo Baxter, Jayde Delpratt, Ryan Elliott and Nick Grant were never household names, but they were quite a big deal in the Smash Hits community in 1994-95. Formerly backing dancers for Sinitta, these young bucks were one of Simon Cowell's first ventures into the world of boybands. So in many ways they were the prototype One Direction. Sort of.
'Never Ever' was the 'choon' (that's what we called them back then) of 1998. The Spice Girls that it was okay for guys to like, All Saints had 'tude, khaki trousers and lots of cleavage. They've all fallen out and got back together a couple of times since they called it a day in 2001, so there's plenty of unresolved tension for the behind-the-scenes filming.
North & South
Nah-nah-nah-nah-nah-nah-nah-nah-nah-nah-nah. The '90s were so cool, we didn't even need good lyrics. Proving our point were odd-looking '90s TV stars/boyband North & South, who used their sub-Byker Grove to market not-so-classic tracks such as 'I'm a Man Not a Boy' and the frankly dire 'Tarantino's New Star'.
Late '90s rock girl combo Hepburn were briefly something when their No.8 single 'I Quit' (a Natalie Imbruglia reject, claims Wikipedia) was used on the Buffy The Vampire Slayer soundtrack. Sadly, other than that and the fact we had quite a crush on the bass player, they weren't much to write home about.
Genuinely good '90s pop act Eternal were the British answer to En Vogue. They gifted us the actually rather good hits 'Stay' and 'Just a Step from Heaven' and more importantly the solo career of Louise 'Naked' Nurding. Things apparently went quite sour with Louise and the other girls so there'd definitely be a spice to any reunion.
UPDATED: Apparently A1 are still going strong in Norway! How did we possibly miss this news?
What '90s pop acts would you love to see reunite on TV? Let us know below!