Avengers Infinity War: Robert Downey Jr, Benedict Cumberbatch and Karen Gillan assemble for red carpet event in Singapore

Thousands of fans queued outside Singapore's Marina Bay Sands Convention Centre on Monday to meet their favourite superheroes -- Iron Man star Robert Downey Jr and Doctor Strange actor Benedict Cumberbatch -- making it one of the grandest Marvel red carpet events. The actors were there to promote their latest offering Avengers: Infinity War along with co-director Joe Russo and actor Karen Gillan.

While the locations of five infinity stones -- Time, Space, Power, Mind and Reality -- are known, the Soul Stone is yet to appear. The Avengers team, ahead of the film's release, assembled in Singapore on Monday to unveil the stone at an event where they met around 7,000 fans from Singapore, Thailand, Indonesia, Philippines, India, Malaysia, China and Russia.

The Hollywood stars also walked on the purple carpet, which was probably inspired by the colour of Thanos, to take selfies with the fans, who sported Avengers masks or were armed with their toys and posters.

"I know you have been waiting patiently for a few hours or more and some of you all day long," director Joe Russo told the fans. The filmmaker, who along with his brother played an important role in giving Marvel superhero films a new dimension, was joined by his wife and two daughters on the red carpet.

Actor Karen Gillan who plays Nebula in MCU, recounted a story to her fans, "I shaved off all my hair which was very long. Marvel guys are amazing. They made me a wig of my own hair which I sometimes wear it for comedic purposes. It's really creepy."

British actor Benedict Cumberbatch who plays Doctor Strange in MCU joined his hands in a 'namaste' to greet the audience. He praised the "very generous and fun" Downey Jr and then went on to speak highly of the young Spider-Man -- Tom Holland.

A few minutes later, fireworks and a loud cheer welcomed Iron Man star Downey Jr on stage. As he shared the stage with Cumberbatch, he joked, "Sorry Mark Ruffalo (The Hulk) the science bro thing is over, it's now about the Batch."

(With inputs from agencies)