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X-Men, Nicholas Hoult

20th Century Fox

Comic-Con fans got quite the treat on Saturday.

Fox surprised the crowd, bringing out the entire cast of X-Men: Days of Future Past, causing a serious screamfest.

Director Bryan Singer posted to Twitter a pic that includes everyone from Ian McKellanPatrick StewartHugh JackmanJames McAvoyMichael FassbenderJennifer LawrencePeter DinklageAnna Paquin and a pregnant Halle Berry

One Comic-Con goer shared that "Walking by Hall H as the entire X-Men: Days of Future Past cast hit the stage & swear the ground shook the screaming/applause was so loud."

A source confirms to E! News there was "Epic nerdgasm going on."

Here's to being a lucky X-Men fan!