In Woman Walks Ahead, a New York City activist and artist named Catherine Weldon (played by Jessica Chastain) travels across the United States to paint the great Native American chief Sitting Bull.

Woman Walks Ahead tells the incredible true story of New York portrait ... the story shows Weldon befriending Sitting Bull and finding herself involved in the Native American people’s struggle ...

The Oscar-nominated actress plays real-life artist Catherine Weldon in the period drama ... mind you — to paint a picture of Native American leader Sitting Bull (Michael Greyeyes).