IN PICTURES | World premiere of Avengers: Infinity War

Writers, directors and stars arrive at the world premiere of "Avengers: Infinity War" on Monday, April 23, 2018, in Los Angeles.

Robert Downey Jr. arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. (Photo by Jordan Strauss/Invision/AP) 

Tom Hiddleston arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Danai Gurira arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Letitia Wright arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Joss Whedon arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. |AP

Benedict Cumberbatch arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Chadwick Boseman, 'Black Panther' arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

'I am Groot...!'. Vin Diesel arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Chris Hemsworth arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Mark Ruffalo arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Stan Lee, left, and Keya Morgan arrive at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Zoe Saldana arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Scarlett Johansson arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Tom Holland arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Kathryn Boyd, left, and Josh Brolin arrive at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Samuel L. Jackson arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Jon Favreau arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

Robert Downey Jr. arrives at the world premiere of 'Avengers: Infinity War' on Monday, April 23, 2018, in Los Angeles. | AP

This image released by Marvel Studios shows, front row from left, Danai Gurira, Chadwick Boseman, Chris Evans, Scarlet Johansson and Sebastian Stan in a scene from 'Avengers: Infinity War,' premiering on April 27. | AP