An unreleased Michael Jackson and Freddie Mercury duet has featured in a new documentary about the life of the late Queen frontman.

A snippet of ‘There Must Be More To Life Than This’ featured in The Great Pretender, which was screened by the BBC earlier this week (October 16). The programme can now be watched by UK residents on the iPlayer.

As well as featuring the aforementioned all-star collaboration, the film includes rare archive footage of Mercury joining forces with Rod Stewart to sing a demo for ‘Take Another Piece of My Heart’, an unreleased song from 1984 and footage of Mercury with the Royal Ballet in 1979.

Outtakes from Queen video shoots also feature, as does footage from Mercury’s 39th Black and White cross-dressing birthday party, which took place at Mrs Henderson’s nightclub in Munich in 1985.

The documentary, which will be available on DVD and Blu-ray, shows Mercury’s earliest filmed interview in Australia and another unseen interview by NBC, both from 1976.

Queen guitarist Brian May recently revealed details of the forthcoming Freddie Mercury biopic on his website.

He confirmed that the film – starring comedian and Borat star Sacha Baron Cohen – will be ready for release in 2014.

He wrote: “The pieces are all falling into place, though we are now on a slightly later schedule – filming is now scheduled to start in the Spring, with Sacha Baron Cohen playing Freddie.”

The Freddie Mercury biopic is being scripted by Peter Morgan, the Oscar-nominated screenwriter behind The Queen and Frost/Nixon.