Benedict Cumberbatch was disappointed that the "revolutionary of journalism" Julian Assange turned down a request to meet him to research his latest role as the WikiLeaks founder in The Fifth State.
Assange, who has been inside the Ecuadorian Embassy in London for more than a year to avoid extradition to the US, said he did not want to meet the actor as he believes the film will only help destroy his organisation.
Cumberbatch told BBC1's The Graham Norton Show, to be broadcast tomorrow night, "He is a revolutionary of journalism ... he made us question what the status quo is, the rule of law and power structures that are corrupt or needed exposing.
"He served democracy a great turn I think. WikiLeaks opened a very good can of worms."
Julian Assange has donned a bright blonde mullet wig and sung You're The Voice ahead of Australia's election next month.
In the rewritten version of John Farnham's hit, Assange sings: "We have the chance to turn the pages over. We can write what we want to write. We've got to make things leak, so we can get much bolder."
Julian Assange has hailed a "significant tactical victory" in the case of Bradley Manning after the former US soldier was handed a 35-year sentence.
In a statement, he said: "While the defence should be proud of their tactical victory, it should be remembered that Mr Manning’s trial and conviction is an affront to basic concepts of Western justice...
"Mr Manning’s treatment has been intended to send a signal to people of conscience in the US government who might seek to bring wrongdoing to light. This strategy has spectacularly backfired, as recent months have proven.
"Instead, the Obama administration is demonstrating that there is no place in its system for people of conscience and principle. As a result, there will be a thousand more Bradley Mannings."
WikiLeaks founder Julian Assange has described Bradley Manning as "the quintessential whistleblower" after the US soldier was convicted of espionage charges.
He accused President Barack Obama of "national security extremism" after an American military judge convicted Bradley Manning over the biggest leak of classified documents in US history.
Praising Manning as "the most important journalistic source that the world has ever seen", Mr Assange said he did not receive a fair trial and called for the verdict to be overturned.
"It can never be that conveying true information to the public is espionage,"Assange said from inside the Ecuadorean Embassy in London, his home for more than a year.
Speaking inside the Ecuadorian embassy in London, WikiLeaks founder Julian Assange said the conviction of soldier Bradley Manning on espionage charges set a "dangerous precedent".
Pte Manning, who has admitted leaking confidential information to WikiLeaks, was convicted of 19 charges.
Mr Assange said the only victim in the case had been the US government's "wounded pride", adding that Manning's disclosures had helped spark the Arab Spring.
Manning's sentencing will begin tomorrow but Mr Assange said there were two appeals within the US justice system as well as the Supreme Court.
British security firm Surveillance Group Ltd has denied bugging the Ecuadorian Embassy in London.
We have this morning heard an accusation the source of which is apparently Ricardo Patino, the Ecuadorian Foreign Minister suggesting that we have bugged the Ecuadorian Embassy.
This is completely untrue. The Surveillance Group do not and have never been engaged in any activities of this nature.
We have not been contacted by any member of the Ecuadorian Government and our first notification about this incident was via the press this morning.
This is a wholly untrue assertion.
Ecuadorian foreign minister Ricardo Patino had earlier said he had "reason to believe that the bugging was being carried out by the company, the Surveillance Group Limited... one of the biggest private investigation and undercover surveillance companies in the United Kingdom."
Ecuador's foreign minister Ricardo Patino has said he believes a British surveillance firm was involved in allegedly planting a secret listening device at the nation's embassy in London.
He told a news conference in Quito that he will request the "collaboration of the British government" on the issue:
After this discovery, the government of Ecuador will request the collaboration of the British government in investigating this issue to discover who is implicated in this espionage operation.
[We] have reason to believe that the bugging was being carried out by...one of the biggest private investigation and undercover surveillance companies in the United Kingdom.
Wikileaks has tweeted a picture purporting to show the bug that was reportedly found in Ecuador's embassy in London.
Ecuador's ambassador to the UK, Ana Alban, has told ITV News the microphone allegedly found inside her embassy is going to be sent away to be tested.
She said: "We found something, but we don't know what it is, and we are sending it to someone...I don't know how long it has been there."
Ecuador's ambassador to the UK, Ana Alban, has told ITV News she had "nothing to say" about the allegations made by her foreign minister that the London embassy was bugged with a hidden microphone: