Watch: Michael Jackson Doc 'Leaving Neverland' Gets First Trailer

After debuting at the Sundance Film Festival earlier this year, the trailer for the upcoming HBO Michael Jackson documentary "Leaving Neverland" got its first trailer.

Directed by Dan Reed, the four-hour film investigates how the music icon allegedly had relationships with two young boys who were fans of the singer when they were 7 and 10 years old. The movie features interviews with Wade Robson and Jimmy Safechuck, who are now grown men, their mothers, their wives, their siblings, and more.

HBO writes "Leaving Neverland" is a two-part documentary that explores "the separate but parallel experiences of" Robson and Safechuck.

"Through gut-wrenching interviews with Safechuck, now 40, and Robson, now 36, as well as their mothers, wives and siblings, the film crafts a portrait of sustained abuse, exploring the complicated feelings that led both men to confront their experiences after both had a young son of his own," HBO adds.

The Associated Press's film writer Lindsey Bahr writes "Leaving Neverland" is "a sprawling account of how their lives intersected with Jackson's at the height of his fame in the 80s and early 90s, and then later as adults when the trauma of what happened in their youth started to emerge in serious ways."

Since debuting at Sundance, the film has been in the headlines. "Leaving Neverland" got a standing ovation at the festival but the Jackson estate has condemned the movie, calling it "the kind of tabloid character assassination Michael Jackson endured in life, and now in death." The estate also accused Robson and Safechuck of being "two perjurers," referencing sworn statements they gave while Jackson was alive, saying he did not molested them.

Robson, a choreographer who has worked with Britney Spears and other top acts, testified for Jackson's defense at the 2005 trial that ended with the pop star's acquittal on molestation charges.

"The film takes uncorroborated allegations that supposedly happened 20 years ago and treats them as fact," the statement said. It also accused the filmmakers of ignoring the accounts of others who said Jackson never harmed children.

Bahr adds:

Jackson was acquitted of molestation charges in 2005 in a case involving another young man. Robson testified at that trial, saying he had slept in Jackson's room many times, but that Jackson had never molested him. Safechuck made similar statements to investigators as a boy. Then in 2013 Robson filed a lawsuit that said stress and trauma had forced him to face the truth that he was sexually abused by Jackson. Safechuck filed a similar lawsuit the following year. Both were dismissed for technical reasons and a judge did not evaluate the merits of the allegations.

"Leaving Neverland" airs on HBO on March 3 and 4. Watch the trailer below.