Avengers: Endgame has finally been unveiled.

Monday night's premiere in downtown Los Angeles was the first time members of the public were able to see the Marvel Studios film, and the first reactions are coming in on Twitter.

The Hollywood Reporter has captured a snapshot of early responses to Avengers: Endgame, which is directed by Joe and Anthony Russo and stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Scarlett Johansson, Mark Ruffalo, Jeremy Renner, Paul Rudd, Danai Gurira and Karen Gillan.

Endgame follows last year's Infinity War, which earned $2 billion at the global box office and saw the villain Thanos (Josh Brolin) destroy half of all life in the universe. Marvel has kept the plot for Endgame largely under wraps, other than the obvious: The Avengers will attempt to avenge what Thanos did in Infinity War.

Fans have been concerned about spoilers and have spent a year speculating about who will live and die. The Russo Bros. penned a letter to audiences urging them not to spoil the film on social media for others. Endgame is billed as the conclusion to 11 years of storytelling that launched with 2008's Iron Man and has seen the Marvel Cinematic Universe grow into one of the most powerful brands in Hollywood.  

See a selection of the reactions below. Initial reactions were positive, with Collider's Perri Nemiroff saying it was "too much at times," though she noted that the payoff was "huge." Official reviews for Avengers: Endgame will hit on Tuesday morning.