Channel 4 has defended a Moors murders TV drama, saying it is not about the "hideousness" of the 1960s killings.
Serkis and Morton recreated Brady and Hindley's police mugshots
The film focuses on Lord Longford, who campaigned for Hindley's release. Oscar-nominated actress Samantha Morton plays convicted killer Myra Hindley.
C4's Kevin Lygo said: "We don't really go into the hideousness of the crimes."
"The drama is about Longford and his Catholic-induced obsession with forgiveness." Hindley and Brady killed five children between 1963 and 1965.
Jim Broadbent plays Longford, a campaigner for penal reform who spent three decades fighting to have Hindley freed from prison.
He believed Hindley, who died in prison in 2002, should be allowed a chance of rehabilitation.
Myra Hindley and Ian Brady were convicted in 1966
Lygo added: "It follows his story and asks whether forgiveness is appropriate in this case. The film has extraordinary performances."
King Kong and Lord of the Rings star Andy Serkis plays Hindley's lover, Ian Brady.
In 1966, Brady and Hindley were convicted of the murders of Lesley Ann Downey, aged 10, in 1964, and Edward Evans, aged 17, in 1965.
Brady was also convicted of the murder of 12-year-old John Kilbride.
In 1987 Brady and Hindley confessed to two further murders - those of Pauline Reade, aged 16, and 12-year-old Keith Bennett.
The bodies of Downey, Kilbride and Reade were found buried on Saddleworth Moor. Bennett's remains have never been found.
Last year, ITV announced it was to make a "major factual drama" about Brady and Hindley with the support of their victims' relatives.
Writer Neil McKay said See No Evil: The Story of the Moors Murders would give "an unsensational account of the most notorious crimes of the last century".
Brady wrote to the chairman of Granada Television - the makers of the drama - to complain about the programme, adding the publicity about his crimes was "now rivalling Coronation Street in longevity".