Marvel Studios has been building toward a showdown with Thanos since in Avengers: Infinity War since 2012, and that confrontation will change the Marvel Cinematic Universe in significant ways. According to Marvel Studios President Kevin Feige, its untitled sequel will even mark the start of a "new age."

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Although the ensemble film doesn't arrive in theaters for another 10 months, anticipation is already high -- and for good reason, says Spider-Man: Homecoming star Tom Holland.

While speaking with the Toronto Sun, Holland promised that Avengers: Infinity War will be the "biggest movie of all time." However, the actor also noted he hasn't yet read the script because of his inability to keep a secret.

"It needs no teasing. That movie literally needs no teasing," he said. "It's going to be the biggest movie of all time. Believe me, no one is ready for that movie. I don't know anything about it or what it's about. I know who the villain is, but that's it. They don’t let me read anything because I'm so bad at keeping secrets."

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Even if he's only talking about the cast list, Avengers: Infinity War is going to be a big movie. It features virtually every hero who has appeared in the MCU, with Black Widow actress Scarlett Johansson saying there's a scene with more than 30 characters. The movie is also set to have high stakes for its heroes, with Feige confirming it will be the final outing for some MCU mainstays.

Whatever happens as a result of the confrontation with Thanos is likely to have a major effect on the sequel to Spider-Man: Homecoming, as it's the first movie released after Avengers 4.

Directed by Joe and Anthony Russo, Avengers: Infinity War boasts a sprawling ensemble cast that includes Robert Downey Jr., Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, Sebastian Stan, Benedict Cumberbatch, Paul Bettany, Samuel L. Jackson, Cobie Smulders, Benedict Wong, Zoe Saldana, Karen Gillan, Vin Diesel, Dave Bautista, Pom Klementieff, Scarlett Johansson, Tom Holland and Anthony Mackie.

The film arrives in theaters May 4, 2018, with the untitled sequel opening May 3, 2019. However you can catch Tom Holland's wall-crawling hero in Spider-Man: Homecoming, which swings into theaters nationwide on Friday.