Before Big Brother's new series Best Shows Ever even began on Sunday night, fans couldn't believe their ears.
The show launched on E4, with hosts Rylan Clark-Neal and Davina McCall presenting proceedings.
They were soon joined by former Big Brother's Little Brother host Dermot O'Leary, and the last BB host Emma Willis.
The series is airing 10 of the best shows ever from 2000 to 2010, starting with an episode from series one.
As the E4 announcer went to confirm what was coming up, fans were left gasping over the sound of a familiar voice.
It was Marcus Bentley, who narrated the show from the very beginning.
While other Big Brother voices stepped in over the years, Marcus was the original and most famous - staying with the show the entire time.
As he spoke, he even said the famous phrase: "You decide."
Fans were feeling super nostalgic, before he soon returned with more news.
This time he said: "It's 20 years of Big Brother and we're back on E4 as Davina and Rylan relive the daddy of all reality TV's best ever shows now.
"Expect strong language and chickens."
Racing to Twitter, viewers shared their love of the moment as Marcus made a comeback.
One fan said: "Just hearing Marcus' voice again got me excited!"
Another agreed: "Oh Marcus I’ve missed you."
A third said: "OMG I MISSED HEARING MARCUS BENTLEY'S VOICE."
Meanwhile, a fourth said: "Omg Marcus doing the continuity announcements on E4!! Incredible!"
Big Brother: Best Shows Ever continues on E4 at 9pm.
