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(Image: HBO/GETTY)

Bandits claim to have leaked the script for an upcoming Game of Thrones episode online – and they plan to release more unless HBO pay them millions.

In a video from “Mr Smith” to the US network’s head honcho Richard Plepler, scrolling white text threatens to “upload entire series” of the smash-hit fantasy series unless a £5mill ransom is paid.

The unknown group – who sign off with "HBO is falling" – also appear to have nabbed the personal phone numbers and email addresses of actors such as Peter Dinklage, Lena Headey and Emilia Clark.

(Image: HBO)

The 1.5 terabyte cache seems to include draft scripts from five GOT episodes, including one upcoming episode, and a month’s worth of email from HBO’s vice president for film programming Leslie Cohen.

The hackers claim they want "our six-month salary in bitcoin" which they say is roughly $6 million (£4.6 million).

The group say they earn upwards of $12-15 million (£9.2-11.5 million) a year from extorting huge companies over similar hacks.

Netizens on Reddit threads in r/freefolk/ have collected what are believed to be the hacked details.

HBO chairman and CEO Plepler described the incident to staff as “disruptive, unsettling, and disturbing”.

But the leaks are nowhere near the scale of Sony’s meltdown in 2014.

On August 2, days after the HBO hack was first acknowledged, Plepler told staff: "We do not believe that our e-mail system as a whole has been compromised, but the forensic review is ongoing."

HBO declined to comment on this latest message.

The network previously told news site TheWrap, “Due to an ongoing investigation, we cannot speak to any specifics.”

HBO has been hacked in the past, with four episodes of GOT season five and several images of Jon Snow's death leaked online.