Ex Nickelodeon star Kyle Sullivan claims abuser Brian Peck had a self-portrait from Chicago serial killer John Wayne Gacy who murdered 33 teenage boys and men and went on to develop pen-pal friendship with the psycho

Disgraced Nickelodeon dialogue coach Brian Peck was a “friend” of serial killer John Wayne Gacy and even owned a painting drawn by him, says actor Kyle Sullivan.

The claims come from the shocking documentary ‘Quiet on Set: The Dark Side of Kids TV’, which looked at allegations of abuse within Nickelodeon.

The first two episodes of the documentary series aired Sunday and actor Kyle Sullivan, who starred in Nickelodeon’s “All That,” talked about what he discovered when he went to Peck’s house.

Sullivan said, “I remember back then, I think it was about two and a half years ago, everyone went to Brian’s house for a barbecue.

“And his house was a bit remote.”

According to the then 14-year-old actor, Peck’s house was full of vintage toys, comic books and a ‘Planet Of The Apes shrine’. Peck was in his forties.

As unusual as the house was for Sullivan, it was what struck him next that was truly terrifying.

He said: ‘I saw a painting in the room that struck me because it had nothing to do with ‘Planet of the Apes’.

“It was of a birthday clown holding balloons.”

He went on to say that when he asked Peck about the painting, the dialogue coach became “very excited” to share its origins.

“He turned the thing over,” Sullivan said, “and on the back it said, ‘To Brian, I hope you like the painting.’ Best wishes, your friend, John Wayne Gacy.”

Gacy is one of the most prolific and infamous serial killers of all time. He raped and murdered 33 young boys and men in Cook County in the 1970s.

He was known as the ‘Killer Clown’ because he often dressed up as one.

Peck also allegedly showed the painting to the young Nickelodeon stars’ parents, telling them that he and Gacy were pen pals.

All the letters from his serial killer ‘friend’ that he kept next to his bed.

Sullivan was certainly not the only actor to make accusations about Peck in the documentary.

Actor Drake Bell of ‘The Amanda Show’ has criticized Nickelodeon for giving him ‘no institutional support’ after reporting the ‘brutal’ abuse he suffered at the hands of dialogue coach Brian Peck, who labeled the network a ‘factory’ that ‘replaceable’ actors like ‘garbage.’

The former child star, now 37, recently exposed the “unspeakable” and “extensive” sexual abuse he endured at the hands of Nickelodeon coach Brian, now 63, when he was just 15 years old.

The Quiet On Set documentary has also made several accusations against creator Dan Schneider and has left the television industry shaken.

When it comes to Peck’s alleged friendship with Gacy and the fact that he would have been pen pals, Peck must have meant that this was the case in the past, since the home visit that Sullivan speaks of took place about eight years after Gacy’s execution.

It is also unclear whether Peck was only friends with Gacy while he was in prison, or if he was indeed friends with him when he was an active serial killer.

John Wayne Gacy in 1978, two years before he was sentenced to death for his 33 murders

Dan Schneider has broken his silence about the “toxic environment” at Nickelodeon in his time

Gacy was convicted in 1980 when Peck was just 20, two years before his career in the entertainment industry began.

Peck was convicted of sex offenses in 2004 and sentenced to 16 months in prison.

After his release, he was hired to work on Disney’s teen show The Suite Life Of Zack And Cody, but when Disney learned about his conviction, he was fired.

Parts three and four of ‘Quiet on Set: The Dark Side of Kids TV’ air on ID and stream on Max Monday.