Paramount+ will be working on Yellowstone prequel series, 1932, starring Helen Mirren and Harrison Ford. The streaming website announced that the Yellowstone origin story will be created by Taylor Sheridan.

The series will stream exclusively on Paramount+ and debut at a date to be determined in December.

Picked up straight to series in February, 1932 “introduces a new generation of the Dutton family and will explore the early 20th century when pandemics, historic drought, the end of Prohibition and the Great Depression all plague the mountain west, and the Duttons who call it home,” the streaming site said in a release.

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Character details for the roles that Mirren and Ford will play have not been revealed.

The news comes ahead of parent company Paramount Global’s Wednesday presentation to Madison Avenue ad buyers. 

1932 prequel comes as the series became a massive hit. The flagship series streams exclusively on NBCUniversal-backed Peacock as part of a licensing deal.

Yellowstone still debuts on Paramount Global-backed Paramount Network.

1932 is produced in-house by MTV Entertainment Studios, 101 Studios and Sheridan’s Bosque Ranch Productions. Exec producers include Sheridan, John Linson, Art Linson, David C. Glasser, Ron Burkle, Bob Yari and Ben Richardson.

The show marks Ford’s first appearance on a scripted TV show since a cameo in a 1993 episode of ABC’s “The Young Indiana Jones Chronicles.”

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Mirren has been part of Prime Suspect and HBO’s Catherine the Great miniseries. The actress won the best actress Oscar for her role in 2007’s The Queen and has earned Primetime Emmys for her work in Prime Suspect, The Passion of Ayn Rand and Elizabeth I.