'Avengers: Infinity War' is already one of the top-grossing films of all time, while 'Black Panther' is the top-grossing superhero pic of all time domestically.

Over the May 18-20 weekend, Deadpool 2 debuted to $301 million globally, joining the unprecedented domination that superhero pics are enjoying at the 2018 worldwide box office. Put another way, the sequel — returning Ryan Reynolds as the sassy, irreverent Merc with the Mouth — has already outgrossed the entire lifetime runs of such 2018 titles as Pacific Rim Uprising ($288.5 million) and Tomb Raider ($273.2 million). And Deadpool 2 will soon overtake the likes of Rampage ($406.9 million) and other 2018 entries that have failed to break out in a major way. Revenue to date for Avengers: Infinity War, Black Panther and Deadpool 2 account for 31 percent of all 2018 domestic box-office revenue, and 57 percent of revenue generated worldwide by the top 10 Hollywood titles. That's an unheard of share.

For example, Hollywood studio superhero titles accounted for 14 percent of domestic revenue last year and, in 2016, 15 percent. Part of the reason that superhero fare is dominating so far this year is the failure of other 2018 event films to take off, including Disney's A Wrinkle in Time ($128 million). Nor did anyone foresee just how enormous Black Panther and Infinity War, both from the Disney and Marvel Studios empire, would be.