Harrison Ford and Helen Mirren will star in the upcoming prequel series (Picture: James Minchin III/Paramount+)

Yellowstone prequel series 1923 had a new teaser trailer dropped, showing Harrison Ford and Helen Mirren in their upcoming roles – and fans can’t wait to gest stuck in.

The spin-off, which is a prequel to the acclaimed Western series, is set several decades before the original show.

With the current fifth season of Yellowstone under way, 1923 is set to premiere on Paramount+ in the UK on December 18, before Yellowstone’s Christmas break.

It will follow Ford, 80, and Mirren, 77, as Jacob and Cara Dutton, the two heads of the Dutton family as they run the Yellowstone ranch.

The series is set 40 years after 1883, which was the first prequel series of the Yellowstone story and starred Sam Elliott and Tim McGraw.

And fans who have long awaited the arrival of Ford and Mirren to the Yellowstone world couldn’t contain their excitement at seeing the two movie stars.

‘You had me at Helen Mirren!’, one fan exclaimed on social media, while another said: ‘This looks amazing! I’d better catch up quick!’

Another said: ‘Harrison Ford is playing a Dutton now too? Sign me up.’

Even pop sensation Lily Allen couldn’t keep her feelings hidden, sharing a picture of Ford and Mirren in character with the caption ‘OMFG’.

She also blamed a certain Twitter owner for not knowing the latest season had already kicked off.

Harrison Ford is returning to TV for the first time in almost 30 years (Pictures: Paramount Plus)

The fifth season of Yellowstone began this weekend, with two brand new episodes being made available to fans on the same night.

Many fans who are still in the process of catching up on Yellowstone are hoping they can finish all four seasons and the 1883 limited series.

‘I’ll need to catch up on all the seasons now,’ one future viewer said on social media.

‘Just when you thought Yellowstone couldn’t get any better,’ another person said on Twitter.

Helen Mirren will be taking on the role of matriarch Cara Dutton (Picture: Paramount Plus)

The original show follows the story of the Dutton family, who run the Yellowstone Dutton ranch in Montana, in north-western USA.

A family drama, Yellowstone follows the conflicts between the Dutton family, neighbouring ranches, and the nearby Broken Rock Reservation.

The series stars Kevin Costner as John Dutton III, and has seen a huge rise in viewership since it began airing in 2018.

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Another planned spin-off, entitled 6666 (reportedly pronounced ‘Four Sixes’) is said to be set in the present day and will follow the Four Sixes Ranch in Texas.

Actor Ke Huy Quan recently opened up about reuniting with Ford, almost 40 years after the pair starred together in the Indiana Jones franchise.

Watch Yellowstone on Paramount Plus.

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MORE : Ke Huy Quan opens up on emotional reunion with Indiana Jones co-star Harrison Ford 38 years later

MORE : Where to watch Yellowstone in the UK

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We’re looking forward to December 18.