Coldplay performs with Hollywood icon Ralph Macchio in Melbourne

Coldplay had a major surprise during their second Melbourne show, bringing an ’80s pop culture icon onto the stage.

Ralph Macchio, who played The Karate Kid in the famous film franchise, joined the band to perform a song he knows rather well.

WATCH THE VIDEO ABOVE: Coldplay invites ’80s icon onto stage.

Together they performed Coldplay’s 2024 song The Karate Kid from the album Moon Music.

Macchio, 62, lip-synched Martin’s vocals while the frontman accompanied him on the piano.

When the song finished, Macchio triumphantly raised his hands in the air — prompting a roar from the appreciative crowd.

He left the stage after an embrace with Martin.

Macchio rose to fame playing the title character Daniel LaRusso 1984 classic The Karate Kid and its two sequels.

The actor more recently reprised his famous role in the 2018 Netflix series Cobra Kai.

Thursday’s cameo came after Coldplay made history on Wednesday night performing for the first time without one of their four founding members.

Just before night one of their Music Of The Spheres tour at Marvel Stadium, bassist Guy Berryman fell ill, leaving the other members of the iconic group to carry on without him.

In an Instagram post after the show, the band said: “Tonight was the first time in our band’s history that we’ve played a show without all four members onstage.

“Guy was taken ill unexpectedly just before the show. Thank you for carrying us through it.”

Earlier frontman Chris Martin addressed the packed stadium, telling fans: “It’s a shame, but we waited until the last minute to tell you that our beautiful bass player Guy is very, very sick.

“I’m sorry for those who were waiting to see him; he won’t be able to play today.

“But we’ll have a slightly different show, and we’ll do our best to make it amazing because we’re in Melbourne with all of you beautiful people.”

Filling in for Berryman was Bill Rahko, Coldplay’s co-producer and engineer, who donned one of the band’s signature space helmets and stepped in on bass.

Martin kept the crowd’s spirits high, joking: “If you notice mistakes, it’s because we only had about an hour to figure it out ... and we have a strange, alien, weird friend character playing bass.

“So you’ll hear Guy, but you just won’t see him. Because he’s vomiting.”

The Music Of The Spheres tour has been a massive success, grossing over $US1 billion ($A1.5 billion) since its start nearly three years ago, Billboard reported.

Following their two-night run in Melbourne, Coldplay heads to Sydney’s Accor Stadium for another two-night stint.

Coldplay’s Melbourne and Sydney dates come almost a year after they visited Australia and controversially only performed in Perth.

The band has not performed in Sydney or Melbourne since November 2016.

On that tour, the band performed five concerts in three states, NSW, Queensland and Victoria — with Western Australia missing out.

Coldplay’s Music Of The Spheres world tour has sold more than six million tickets since it launched early in 2022.