Marvel Studios' "Avengers: Infinity War" made an estimated $630 million at the worldwide box office for its opening weekend, according to Disney.

Marvel Studios' "Avengers: Infinity War" made an estimated $630 million at the worldwide box office for its opening weekend, according to Disney.

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A spoiler-y discussion about Marvel's 'Avengers' mashup

By now, millions have flocked to opening-weekend screenings of "Avengers: Infinity War," leaving them debating the movie's twists, turns and ending, including what it all might mean for the fourth "Avengers" movie due next year -- and really the entire Marvel cinematic universe.