ACTOR Craig McLachlan is expected to this week launch legal action against the ABC and Fairfax Media over sexual misconduct claims.

The Gold Logie-winning actor has vowed to fight the claims of sexual misconduct against him saying his career has been "annihilated" by the accusations.

In an interview with The Sunday Telegraph the former Rocky Horror star admitted the show's backstage culture could be lewd, but insisted he was innocent of the allegations against him.

McLachlan left the stage show mid-January amid allegations of sexually inappropriate behaviour.

It came after three women - Christie Whelan Browne, Angela Scundi and Erika Heynatz - who appeared in the 2014 production of the Rocky Horror Picture Show told the ABC McLachlan inappropriately touched them or exposed himself. A woman and a man who worked as part of the crew have also gone to Victorian police, who are investigating the allegations.

McLachlan says he doesn't understand why the allegations were made. "By God I will fight this," he told The Sunday Telegraph.

Producers of the popular TV show The Doctor Blake Mysteries in which McLachlan stars have also temporarily halted preparations for the new series on the Seven Network while the allegations are investigated.

Cast and crew of the TV show have reportedly revealed claims of McLachlan's on-set behaviour, including an alleged incident where he held a banana to his crotch and thrust it into the face of an actor.

The ABC and Fairfax Media declined to comment yesterday.