The search is on for a lone and emotional Oasis fan featured in a film charting the brothers' comeback tour after the first gig in Cardiff, the directors have said.
Will Lovelace and Dylan Southern's portrayal of the band's world tour in 2025 also captured the moment Liam and Noel reunited in the rehearsal studios following a 15-year hiatus.
Reflecting on the opening gig at the Principality Stadium, Southern said: "That lad in particular is amazing because he's just had the experience of his life and he doesn't know what to do with it. And we want to find him."
He went on to say: "What it resulted in and what we didn't expect is a music documentary that's actually a feel-good film."
Oasis's reunion gig in Cardiff was a "hugely emotional" experience that took Noel Gallagher by surprise.
Southern said: "Noel says in the film that he completely underestimated what it would be like, and it really did kind of hit him hard."
Lovelace said: "Those opening few moments, just as they're about to go on stage in Cardiff, and then the first song, was definitely a turning point on the tour but certainly in the film."
The directors told Behnaz Akhgar on BBC Radio Wales how the brothers' relationship had grown as the tour had progressed.
The film, Don't Look Back In Anger, shows that Columbia was the first song they practised during the reunion rehearsal.
Under Noel's instruction, the band had been piecing together the set list before Liam's arrival.
"There was no kind of big entrance," said Lovelace.
"He walked in and said ''should we do this then?' and then [the band went] straight into a two-hour set."
Southern explained that the brothers "were that estranged that Noel's youngest sons and Liam's sons hadn't met".
"They were on tour for the whole time and they became like friends and more importantly family," he said.
"I think that was another huge thing in those barriers coming down between Liam and Noel was that suddenly there's this togetherness and harmony."
But it was the Cardiff gig that showed the kind of reception the band could expect to receive from fans old and new as they went back on the road.
"The sense of anticipation was huge," recalled Southern.
He said Noel "wasn't expecting... the emotional response" from fans.
"Looking out at the crowd and seeing three generations of a family out there, and not just fans from back in the day."
He added: "I'll never have another experience in my life like the one that we had in Cardiff. It was amazing."
Directors Will Lovelace and Dylan Southern told BBC Breakfast they wanted to find the fan who featured in the Don't Look Back In Anger film charting the Gallagher brothers' reconciliation on stage.
Southern said: "There's a real moment of kindness there because a complete stranger comes over and gives them a hug and I think these shows - we didn't know what we were to expect going out to film them but they really brought out the best in people."
He went on to say: "[The film is] kind of full of hope and it's a great thing to be able to put out into the world in the sort of times we're living in."
The film-makers had 1,800 hours of raw footage of the band with six weeks of rehearsals and 13 shows at their fingertips.
Oasis: Don't Look Back In Anger is in cinemas from Wednesday, 9 September.