Former Hey Dad! star Sarah Monahan says she was not the only cast member sexually assaulted behind the scenes of the hit show.

Monahan, who played schoolgirl Jenny Kelly, was nine when she began work on the series, which aired on the Seven Network from 1987 to 1994.

She told Woman’s Day magazine last week that a man who worked on the show fondled her and exposed himself to her.

She did not name the man nor did she say if he was a member of the cast or crew, but she did describe him variously as “big”, “powerful” and “well respected”.

Speaking on the Nine Network on Monday, Monahan said there were other other victims among the Hey Dad! cast.

“I guess I was the smallest and I know I wasn’t the only one. The others are just still not going to speak about it,” she said.

Monahan said she was her family’s breadwinner following the death of her father shortly before Hey Dad! began its run.

She said she was fearful she would be forced out of work if she spoke up about the alleged perpetrator.

“I knew he was a dirty old man. I knew it. But I was paying the rent essentially, so there wasn’t much you could do,” she said.

“And it was always, ‘keep it hushed because this is the most successful show on television and people don’t want to know that’.

“A lot of people knew, but it was ‘you can’t talk about it, you can’t go public, you can’t press charges’.

“Then, ‘he’s a very powerful person’ and it becomes he said-she said.”

Another alleged victim of the man has made similar allegations to Nine, saying they were inspired by Monahan to come forward.

Monahan said she intended to go to the police with that person to tell their stories.

“I think that [the alleged attacker] should definitely burn in hell. I think they should go to jail,” she said.

Nine confirmed a NSW Police detective superintendent is investigating the allegations.

- AAP