It comes after the American Beauty and House Of Cards star, 64, was acquitted of a number of sexual offences alleged by four men between 2001 and 2013, following a trial at Southwark Crown Court in July 2023.
In a trailer for the two-part docuseries, Spacey Unmasked, premiering this month on Channel 4 in the UK, a narrator says that men "go on the record about their experiences with the acclaimed actor".
On Thursday, the American star claimed he had "repeatedly requested" Channel 4 give him more than seven days to respond to the allegations made about him in their documentary and said the broadcaster refused.
Over the last week, I have repeatedly requested that — Kevin Spacey (@KevinSpacey) @Channel4 afford me more than 7 days to respond to allegations made against me dating back 48 years and provide me with sufficient details to investigate these matters. Channel 4 has refused on the basis that they feel that…May 2, 2024
On X, he wrote: "Over the last week, I have repeatedly requested that @Channel4 afford me more than seven days to respond to allegations made against me dating back 48 years and provide me with sufficient details to investigate these matters.
"Channel 4 has refused on the basis that they feel that asking for a response in seven days to new, anonymised and non-specific allegations is a 'fair opportunity' for me to refute any allegations made against me.
"I will not sit back and be attacked by a dying network's one-sided 'documentary' about me in their desperate attempt for ratings.
"There's a proper channel to handle allegations against me and it's not Channel 4.
"Each time I have been given the time and a proper forum to defend myself, the allegations have failed under scrutiny and I have been exonerated."
Spacey then revealed he will be issuing a response this weekend and added that Channel 4 and Roast Beef Productions, which helped produce the show, may find themselves "speechless".
Oscar-winner Spacey was one of the most recognised faces in Hollywood until allegations of sexual misconduct were made in 2017, with streaming giant Netflix cutting ties with the actor.
Channel 4 announced it had commissioned the upcoming documentary in 2022 and said it will "follow the outcomes of two court cases against Spacey".
Responding to Spacey's comments, a Channel 4 spokesperson said: "Kevin Spacey has been given sufficient opportunity to respond."
The documentary will air this weekend.
Channel 4 and Roast Beef Productions have been approached for comment.
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