The Let It Shine contestants will perform some superstar duets this weekend.
After four weeks of auditions and one tough dance assessment, 40 hopefuls are left in the running to join Gary Barlow's new boy band themed musical.
5 members are needed for a band to play in the stage show, which is based on the music of Take That.
This week the 40 boys will be split into groups of eight who will take to the stage in all singing, all dancing performances with some familiar faces.
The boys will seek to prove their worth as they collaborate with some of the UK’s most-loved artists with spectacular staging and one big song after another.
The guest performers revealed are Busted, Beverley Knight, Melanie C, Olly Murs and Kaiser Chiefs.
Five groups of eight individuals will perform with one of the guest artists. The judges will then select five individuals from each group of eight to go through to the live finals which begin next Saturday night.
Lulu was previously announced to join permanent judges Gary Barlow, Dannii Minogue and Martin Kemp as guest judge for this second stage of the competition.
Guy Freeman, Editor, Let It Shine said: “Having seen everyone perform as individuals in the auditions, this spectacular show is all about them working together in groups - supporting each other and their guest star artist.
"Singing and dancing, these specially arranged and staged performances will definitely put them through their paces, as well as provide viewers with some show-stopping entertainment.
"The contestants have really been putting the work in and I'm sure the judges are going to have some tough decisions to make.
"Those who make it through this stage will be one step closer to the once-in-a-lifetime opportunity of performing in a new touring musical featuring the songs of Take That.”
Let It Shine is hosted by Graham Norton and Mel Giedroyc and will air this Saturday night from 6:40PM.