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KSI is bringing his high-energy personality to the America’s Got Talent Season 21 finale. The YouTube star, musician, boxer, and entrepreneur has been announced as a guest Judge for the competition’s two-night live conclusion, where he will join Sofía Vergara, Howie Mandel, and Mel B at the Judges’ Table.
The special finale airs September 22 and 23 on NBC at 9 p.m. ET. Viewers can also stream the episodes the next day on Peacock. The announcement comes as Simon Cowell continues recovering from an operation and remains absent from the series.
KSI Joins America’s Got Talent for a High-Stakes Finale
During the Season 21 finale, the Top 10 Acts will compete for America’s Vote. Unlike earlier rounds, the Judges will not have Golden Buzzers available, and they cannot eliminate performers. Their role will instead focus on offering feedback, reactions, and guidance as the finalists make their last case to viewers.
That means the public will have the decisive voice in determining the winner. Fans will be able to vote for their favorite acts, making the finale one of the most important moments of the season for the contestants and the performers supporting them.
KSI’s addition gives the finale a fresh international perspective. He has built a wide-ranging career across digital entertainment, music, combat sports, and consumer brands, making him a natural fit for a show known for celebrating performers from every background.
Who Is KSI? From YouTube Star to Business Powerhouse
Born Olajide Olatunji, KSI first became famous online as a teenager. He began using YouTube at age 15, creating gaming and commentary videos under the name KSI. The initials stand for Knowledge, Strength, and Integrity, while friends often call him JJ.
According to Vice, KSI had become a millionaire by the age of 21 through his online work. At one point, he had more YouTube subscribers than any other creator in Britain except the members of One Direction. His digital success helped establish him as one of the most recognizable personalities of the internet era.
Over time, KSI expanded beyond online video. He has released two rap studio albums, competed as a professional boxer, and become the owner of Misfits Boxing. He also co-created Prime, the popular beverage company launched with fellow content creator Logan Paul.
In a 2025 interview with Square Mile, KSI reflected on his decision to move beyond YouTube. He explained that he once felt he had reached the platform’s ceiling and wanted to prove himself in other industries. That approach has helped him build a career that reaches well beyond social media.
KSI Already Has Got Talent Experience
Although this is KSI’s first time joining the America’s Got Talent panel, he is already familiar with the Got Talent franchise. He served as a guest Judge on Britain’s Got Talent during its 18th season before becoming a full-time Judge for the following season.
During his guest appearance, KSI used his Golden Buzzer on magician Harry Moulding. The decision proved especially memorable because Moulding went on to win the entire season. KSI’s success in identifying a future champion gave viewers an early look at his instincts as a talent evaluator.
He has also appeared in other entertainment settings, including Celebrity Bake Off. His experience in performance, competition, and live entertainment could make him an energetic presence during the AGT finale.
Why Simon Cowell Is Missing From AGT Season 21
Simon Cowell’s absence has led America’s Got Talent to bring in several guest Judges throughout Season 21. Kenan Thompson and Heidi Klum have also filled in during the live shows, giving the season a rotating panel of familiar entertainment figures.
Cowell is expected to return to the series after recovering from his operation. For the finale, however, KSI will sit alongside Sofía Vergara, Howie Mandel, and Mel B while Host Terry Crews guides the competition.
The two-night event will combine celebrity reactions with the final performances from the season’s strongest acts. With the outcome resting entirely in viewers’ hands, fans will play the most important role of all.
How to Watch KSI on America’s Got Talent
- Show: America’s Got Talent Season 21
- Event: Two-night live finale
- Dates: September 22 and 23, 2026
- Time: 9 p.m. ET
- Judges: KSI, Sofía Vergara, Howie Mandel, and Mel B
- Host: Terry Crews
- Streaming: Peacock the following day
FAQs About KSI on America’s Got Talent
Why is KSI joining America’s Got Talent?
KSI is joining the Season 21 finale as a guest Judge while Simon Cowell recovers from an operation.
When will KSI appear on AGT?
KSI will appear during the two-night live finale airing September 22 and 23, 2026, at 9 p.m. ET.
Who will KSI judge alongside?
He will join Sofía Vergara, Howie Mandel, and Mel B at the Judges’ Table, with Terry Crews serving as Host.
Can KSI award a Golden Buzzer during the finale?
No. The finale Judges can provide feedback and guidance, but there are no Golden Buzzers or eliminations during this stage.
