The Avengers stars have proved themselves heroes in real life after assembling to stand with the people of Standing Rock in protest of the Dakota Access Pipeline.

Marvel stars Samuel L. Jackson, Mark Ruffalo, Chris Evans, and Chris Hemsworth have taken to social media to get their fans to sign a petition against the North Dakota pipeline construction on the Standing Rock Indian Reservation.

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"Tell @POTUS to say #NoDAPL by signing the http://standwithstandingrock.net petition," Evans (Captain America) tweeted.

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And his cast members went on to share the same sentiment across their own social media platforms.

Hemsworth (Thor), who has been working with Kiwi Taika Waititi on the new Thor: Ragnarok, has shared photos of people at Standing Rock, and of himself and Waititi holding a "We Stand With Standing Rock" sign.

While Jackson (Nick Fury) posted a video saying: "I'm Samuel L. Jackson, and I acknowledge the First Peoples of America. I stand for their right to clean water, and today, I stand with Standing Rock."

I'm saying #nodapl and @barackobama should too! Sign the petition and standwithstandingrock.net #standwithstandingrock

A post shared by Samuel L Jackson (@samuelljackson) on

And Ruffalo (The Hulk) not only helped donate solar trailers to help the Standing Rock protesters - but continued to post videos to raise awareness, stating: "I acknowledge the first peoples of America...today I stand with Standing Rock".

Peaceful resistance. #nodapl #standingrock

A post shared by Mark Ruffalo (@markruffalo) on