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Thor and Captain America stand together in a desolate, debris-strewn environment, with Thor holding Mjolnir and speaking the line "Guys, I'm bringing the party to you," before the scene cuts to a close-up of Iron Man repeating the same line. The sequence continues with Black Widow looking on with a serious expression, then shifts to a wide shot of a dark, winged figure flying across a bright sky, followed by a large, dark creature with a "HAPPY BIRTHDAY" banner strapped to its back, which then crashes into the ground, creating a massive explosion of debris and smoke.