McLachlan is suing the companies and former co-star Christie Whelan Browne over articles and reports claiming he bullied and indecently assaulted her and two other female cast members during a 2014 production of The Rocky Horror Show.
The actor has denied the allegations and the defamation hearing is set down for four weeks from February 4.
On Friday,McLachlan's lawyer Matthew Richardson applied to have the proposed further amended defence struck out,saying three new complaints had been added relating to the actor's time on the TV show The Doctor Blake Mysteries.
Loading
He said the conduct alleged was mostly verbal,while there was one unwanted kiss and one instance of inappropriate touching.
Arguing against the application on Monday,Mr Blackburn named the women as Cate Wolfe,Anna Samson and Tamzen Hayes and a fourth woman as Teagan Wouters from anotherRocky Horror production.
He said that initially when spoken to the potential witnesses said they did not want to be involved in the case but more recently indicated they were willing to give evidence in the proceedings.