Robert Downey Jr., Chris Hemsworth and other members of the Avengers superhero team on Monday celebrated the final chapter in a 22-movie saga that ranks as the movie industry's highest-grossing franchise of all time.

At a lavish premiere in Los Angeles, hundreds of industry VIPs, cast members, fans and media watched the first showing of "Avengers: Endgame," the three-hour action spectacle that has been held tightly under wraps.

The movie begins rolling out in theaters around the world on Wednesday.

Downey Jr. (Iron Man), Hemsworth (Thor), Scarlett Johansson (Black Widow), Chris Evans (Captain America) and others walked a purple carpet underneath a giant, spinning Avengers logo set up inside the Los Angeles Convention Center. A cavernous exhibit hall was turned into a movie theater with a large screen and stadium-style seating.

"I'm excited that I'm finally going to get to see the movie," said Paul Rudd, who plays Ant-Man and, like other cast members, had not seen the finished film due to Marvel's secrecy around the project.

Rudd said he had been traveling the world to promote the movie and "trying to talk about it the best we can, and to do all of that without having seen the film is a strange experience. So now, to finally see the movie is great."

Other A-list stars packed the premiere, including Chris Hemsworth's brother Liam and his wife Miley Cyrus, and Matt Damon, who had a cameo in 2017 film "Thor: Ragnarok."

"Endgame" concludes the story of the six original Avengers in Marvel's cinematic universe – Iron Man, Captain America, Black Widow, Hawkeye, Hulk and Thor.

It picks up after last year's "Avengers: Infinity War" left fans hanging when many of the Marvel heroes seemed to turn to dust at the hand of the villain Thanos, played by Josh Brolin. In "Endgame," the surviving superheroes plot to kill Thanos and try to undo his damage.

After the screening, the stars gathered on stage and hugged. Evans told the crowd that he "cried like six times" while watching the film. "I cried more than six times, Chris," Hemsworth said.

Mark Ruffalo, who plays the Hulk, said working on the films had been "the trip of a lifetime."

Highest-grossing franchise in film history

The 21 previous movies from the Walt Disney co-owned Marvel Studios are the highest-grossing franchise in film history, generating more than 18.6 billion U.S. dollars at global box offices since 2007.

"Endgame" may set an opening weekend record in the domestic market, according to box office analysts. “Infinity War” holds the current record of 257.7 million U.S. dollars over its first three days in the United States and Canada.

Initial reactions to "Endgame" were positive.

Erik Davis, managing editor at Fandango, called the movie a "masterful epic." "If Infinity War is the brawn, Endgame is the brains. And wow, what an ending!" Davis wrote on Twitter.

While "Endgame" wraps up the "Avengers" story, many Marvel characters will live on in future movies. Spider-Man, for example, returns to the big screen in July in "Spider-Man: Far from Home."

A "Black Panther" sequel is also in the works.

"There will be new beginnings," said Marvel Studios President Kevin Feige. "There will be new stories. There will be new ways of doing it, but for now the focus is on the endgame."

(Cover: Robert Downey Jr. (R) and Susan Downey attend the world premiere of "Avengers: Endgame" on April 22, 2019, in Hollywood, California. /VCG Photo