Some of the celebrity guests lined up for ACE Comic Con Seattle. (ACE Images)

Chris Hemsworth, star of the “Thor” superhero film franchise, won’t be the lead attraction at the upcoming ACE Comic Con in Seattle.

Hemsworth tweeted his apologies on Friday, citing last-minute scheduling conflicts that would prevent him from attending the first-ever event at the WaMu Theater and CenturyLink Field Event Center on Friday, Saturday and Sunday.

ACE said that two Marvel Avengers have been assembled to take Hemsworth’s place: Sebastian Stan (Winter Soldier) and Anthony Mackie (The Falcon). They will join Tom Holland (Spider-Man), Tom Hiddleston (Loki), Grant Gustin (The Flash), Elizabeth Olsen (Scarlet Witch), Paul Bettany (Vision) and more actors as well as stars from World Wrestling Entertainment.

ACE caters primarily to fans who looking for photo-ops, autographs and celebrity-oriented programming. Previous ACE Comic Cons have been held in Long Island, N.Y., in December, and Glendale, Ariz., in January.

Beyond the stars, ACE will also feature content creators, cosplay, vendors and exhibitors. Get ticket information on the ACE website.

ACE posted information on Instagram alerting fans about their options if they had purchased a photo op with Hemsworth.

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