He’s helping Sienna’s character and a young girl, probably his sister, into a hidden shelter while their home is attacked in the action-packed scene.
“It’s all right – I’m gonna be with Dad,” he tells them, before shutting the door.
![Kevin Costner and Hayes Costner](https://cdn.images.express.co.uk/img/dynamic/79/590x/secondary/Kevin-Costner-and-Hayes-Costner-5236130.jpg?r=1709027193029)
Kevin previously teased his son was “very good” in the film during a chat with People in 2022.
“Hayes plays the namesake character that I actually play in the movie. He’s 13 years old and the screenplay’s been around longer than that,” he said.
The Yellowstone actor shares son Hayes with his ex-wife Christine Baumgartner, and admitted the casting decision was an excuse for them both to spend more time together.
“I kind of did it on purpose, so he could be hanging out with me,” Kevin said.
![Kevin Costner, Hayes and Cayden](https://cdn.images.express.co.uk/img/dynamic/79/590x/secondary/Kevin-Costner-Hayes-and-Cayden-5236129.jpg?r=1709027193113)
“And the same thing for Cayden, same thing for Grace.
“I’m like any other parent, I’m trying to figure out, like, ‘This is really neat. You should come be with me.’”
Horizon is intended to be a four-part cinematic saga, though at the moment just two parts are completed and ready for release this year.
A synopsis says the blockbuster series “explores the lure of the Old West and how it was won – and lost – through the blood, sweat and tears of many.”
Kevin also shares son Cayden, 16, and daughter Grace, 13, with his ex Christine, as well as daughters Annie and Lily and sons Joe and Liam from past relationships.
Horizon: An American Saga premieres on Friday, June 28, and Yellowstone is available to watch on Paramount Network.