“Captain Marvel” became the 2019 box office’s first $1 billion hit on Wednesday, along with being the seventh film from Marvel Studios and the 38th film of all time to hit that 10-digit benchmark. Unlike past Marvel Studios hits that have grossed $1 billion, “Captain Marvel” was the first to do so with a lead character who wasn’t introduced in a previous Marvel film. Even “Black Panther,” the highest-grossing film of the 2018 domestic box office, had its Wakandan superhero introduced in “Captain America: Civil War.” “Captain Marvel” did have the presence of Samuel L. Jackson’s fan favorite Nick Fury,...