Prosecution lawyer Matt Fisher alleged McLachlan "went beyond the role he was directed to perform" in relation to the allegations.
He said McLachlan assaulted one female co-star during the scene in which he was meant to be simulating a sex act, which took place out of sight of the audience.
Aside from kissing her more than 20 times, McLachlan had once use his finger to trace the outline of the woman's genitals, Fisher told the court.
"(The woman) felt as if she was trapped," he said.
McLachlan has also been accused of pushing his groin into the stomach area of another woman. He also kissed the woman during a show, without being directed to do so, forcing his tongue into her mouth.
Fisher told the court the woman had allegedly said to McLachlan: "Don't you ever do that to me again."
McLachlan had allegedly replied: "Don't you dare speak to me like that. You are nothing, I will end you."
McLachlan's lawyer Stuart Littlemore will argue some of the alleged incidents didn't occur, while others weren't indecent.
He said when McLachlan had given a woman an unexpected kiss on stage, he had the "license and discretion to ad lib."
The four alleged victims will give evidence about the incidents in a closed court.
After the women's allegations were published, McLachlan initiated defamation proceedings against Fairfax Media, the Australian Broadcasting Corp., and a former co-star. That case has been delayed until after the criminal charges are resolved.
- AP