The actress appeared in one of the MCU's first films, 2011's 'Thor.'
Natalie Portman was there for one of the MCU's very first films, so it's only fitting that she returned for the Endgame.
The actress made a surprise appearance at the Los Angeles premiere of Avengers: Endgame on Monday, dazzling in a sleeveless black bodysuit with a bow-tie top and a high-waisted, embroidered black skirt with a floor-length slit.
Her presence on the carpet might have confused casual fans, as Portman has not appeared in a Marvel film since 2013. The actress starred as scientist Jane Foster, Thor's Earth-born love interest, in both Thor and Thor: The Dark World, but never crossed over to any of the ensemble flicks. (Unless this is a spoiler for a surprise Endgame cameo?!)
ET spoke with Portman's MCU co-star, Chris Hemsworth, on the carpet, who admitted that the emotions surrounding Endgame -- the culmination of 10 years and 22 films worth of origin stories and world-saving heroics -- had everyone feeling a little "nervous."
"It's always a nerve-wracking experience, but, I don't know, this was-- we literally left it all on the field with this one, and it was a combination of about 22 films, 10 years of work, and so I think we all have a sense of pride," he added. "It's a bittersweet quality to it, because this is the last time this gathering of this group of people is gonna be here together."
Avengers: Endgame is in theaters on Friday.
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