EastEnders fans couldn't believe their eyes on Tuesday, during another classic episode of the BBC soap.
Every Tuesday, an iconic episode from over the years plays on the channel - with new episodes currently off air due to the coronavirus pandemic.
There's been some old faces in the episodes, and even some characters that were played by different actors at the time.
In the latest one, it was Syed Masood's wedding to Amira that took centre stage, amid his bombshell to mum Zainab that he was gay.
He'd been having a secret romance with Christan Clarke, before going ahead with his wedding due to his family's strict religious beliefs.
Christian hoped to stop the ceremony, but the wedding went ahead while viewers of the show know what happened next.
During the episode, he ended up being stuck at the ceremony when Syed's oblivious father Masood asked him to stay.
Peter Beale, the stepson of Christian's sister Jane, was at the ceremony with his twin sister Lucy.
While Peter is still on the show now, he's played by a different actor to the 2010 episodes - currently portrayed by Dayle Hudson.
But Peter has actually been portrayed by seven different actors since his birth in 1993.
In the classic episodes from 2010, Peter was played by the fifth actor in the role Thomas Law.
Viewers couldn't believe their eyes when he popped up on screen, and they remembered this face of Peter.
Revealing the nostalgia that seeing him again gave them, viewers raced to Twitter to share their shock at Peter's different face.
One fan said: "OMG! THOMAS LAW was Peter I forgot that he was in this episode."
Another tweeted: "Peter No. 5!"
A third added: "Awww who remembers when Thomas Law played the teenage Peter ..."
Last month, the actor surprised fans with a topless photo, showing off his ripped body - and he looked nothing like his days as Peter a decade ago.
EastEnders' classic episodes continue Tuesdays at 7:30pm on BBC One.
