Disney officials are working to grant a terminally-ill man's wish to attend an advanced screening of Avengers: Endgame before he dies.

The highly-anticipated sequel to Avengers: Infinity War isn't due to hit theatres until late April (19), but a Reddit user known only as Alexander has launched a campaign online, seeking to view the film months before its release as his health is quickly deteriorating.

In a post titled, Dying Before April: My Endgame, Alexander explains he is suffering from "Liver cancer, mouth cancer, bone marrow failure," as a result of the rare genetic disease fancomi anemia, which seriously affects the body's production of bone marrow.

"Will probably be dead before April," he wrote. "I've heard of people getting early screenings before. How do I get in on this action?

"I'm not a child or anyone with a particularly tragic story. Just a normal guy. I'm 33, lost my sister three years ago to the same rare genetic disease it turns out I have too. I'll leave behind a devoted girlfriend and an adopted greyhound."

Reddit users have since helped to make the post go viral by using the hashtag #Avengers4Alexander, attempting to bring the plea to the attention of Disney chiefs, and the film's directors Anthony and Joe Russo.

Alexander, who is thought to be an Australian native, has since provided a series of updates for readers, revealing Marvel star Chris Hemsworth, who portrays Thor, is thought to have helped raise the issue with studio heads.

"Also, because Australia is a small place, turns out I know a guy who knows a guy who is chums with Chris Hemsworth. I think they called him tonight on my behalf," he wrote.

Now Alexander has finally been contacted by Disney chiefs, who are helping to work out the details to make his wish come true.

"Disney have reached out and we are discussing options," the fan shares. "I cried when I read their email. It's everything I hoped for and I owe it to all of you".

It's not the first time Disney officials have granted fans' dying wishes for special screenings - a Star Wars devotee was able to see Rogue One: A Star Wars Story months before its launch in December, 2016, while another saw Star Wars: The Force Awakens early, just days before he lost his battle with cancer in 2015.

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