FEELY, Mont.—Helen Mirren had her shoes off and her feet propped close to a hissing propane heater.
With co-stars Harrison Ford and Timothy Dalton she was huddled in a nook of a hollow building, a film set that looked like a stately stone-and-timber lodge on a snowy hill outside Butte, Mont.
The actors were keeping warm while running dialogue for an outdoor scene they had tried in vain to shoot two days earlier, when subzero temperatures made it impossible for them to enunciate their lines.
It was early December, winter was bearing down, and a premiere date was looming in two weeks for “1923,” a big-budget TV series saddled with two mandates.
The first: to pull audiences deeper into the stories linked to the most-watched series on television, “Yellowstone.” The second: to do so on deadline as Paramount Global , the company behind “Yellowstone,” races to capitalize on the show’s popularity and fix a major gap in its streaming-television inventory.