Britain's Got Talent star Marc Spelmann declared the show "made a mockery of entertainment" in a scathing Twitter rant before he returned as mystery magician X.
The illusionist was on the reality show last year, but returned for the 2019 series in a mask performing under the name X.
Last year, he was embroiled in controversy as he got caught slamming the show in a series of blistering tweets, sent before his first audition.
In unearthed tweets from 2013 - the year shadow theatre act Attraction won - the magician blasted BGT, calling it a "mockery of entertainment" and urging his followers to switch off.
One tweet referred to the musician who left her seat to egg show boss Simon Cowell during the live final of the series.
It stated: "#bgt #eggattack musician chucking eggs at Simon. Wonder if it was truly random or a publicity stunt to detract from poor final..??"
Another unearthed by The Sun fumed: "This is the last I'll say I promise. #bgt is a mockery of entertainment. It's a joke. Simon is laughing at the deluded public. Do not vote!"
Spelmann told Mirror Online: "I've changed rather a lot in the last six years and the off-hand tweets I made about Britain's Got Talent many years ago in no way reflect my thoughts and feelings on the show now."
The tweets shocked BGT fans as the news came after his performance on last year's show left viewers in tears.
He tugged at heartstrings as he opened up about his wife's struggle with IVF and battle with cancer while pregnant in the middle of his performance.
"Oh god it's emotional," wailed Ant as tears streamed down his face as he watched from the sidelines with buddy Dec Donnelly, who was also crying.
After getting a standing ovation from the audience, Marc also received a hug from teary Ant, who said: "You had me in tears man."
Spelmann returned to the show for the 2019 series and kept his true identity under wraps as he performed as X during the audition phase and the semi-final this week and hadn't even spoken on stage before tonight.
The talented illusionist finally took off the creepy white mask to show who was hiding beneath - and the judges' jaws were left on the desk when they saw who it was.
He said: "It was always about hope. I’m never giving up. It’s been an honour sharing X with you. I’m X."
The reveal was made using a powerful montage of his previous performances which ended with Ant repeating: "Imagine at the end he take it off and it's someone we know?"
