Looking to score tickets to the hotly anticipated "Avengers: Endgame"? Get in line.

Just as presale ticket sales for the next Marvel Studios film went online Tuesday morning, sales just as quickly seemed to have gone offline. The rush of activity took down the AMC Theatres site and app, left fans with over hour-long waits at ticketing site Fandango, and also caused issues with the Regal Cinemas and Atom Tickets apps.

Fandango was still showing wait times of over an hour to purchase tickets as of 10:30 a.m. ET Tuesday, while the AMC website and app continued to have issues. Atom Tickets were loading, but the site was still alerting to errors when trying to purchase tickets.

Needless to say, Marvel fans were not pleased, with "Endgame" related hashtags taking up four of the top spots in Twitter's trending topics in the U.S., including one devoted specifically to Fandango, as fans voiced their displeasure.

In a tweet, AMC acknowledged the issues, promising that it was working on a fix and telling fans to "keep trying."

As of 12:35 p.m. ET AMC's website and app were down completely while Fandango "paused" its line for AMC orders.

By 3:12 p.m. ET both the AMC and Fandango websites appeared to be back online, though AMC's website and app still were showing some issues. Ordering from Fandango for an AMC theater, however, did work.

Even with all the issues, Fandango still said "Endgame" broke its first-day presale record. According to the movie service, the film passed previous record holder "Star Wars: The Force Awakens" within "the first six hours of presales."

The culmination of the 22-film Marvel Cinematic Universe "Infinity Saga," the new Avengers film is the sequel to last year's blockbuster "Avengers: Infinity War." That film grossed over $2 billion at the worldwide box office, with one Hollywood trade already speculating that "Endgame" could do over to $800 million on its opening weekend worldwide.

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Shares of Disney, which owns producer Marvel Studios, closed Tuesday down 55 cents to close at $111.96 . The first U.S. theatrical showings of "Avengers: Endgame" begin April 25.

Follow Eli Blumenthal on Twitter @eliblumenthal