The looming court battle follows a dramatic on-air fallout with his long-time co-host Jackie O Henderson.

Radio star Kyle Sandilands has filed legal proceedings against his former employer ARN after the network terminated his $100 million contract following his fallout with co-star Jackie O Henderson.

Proceedings were filed in the Federal Court against ARN and Commonwealth Broadcasting Corporation (CBC), the licence holder for KIIS 106.5 Sydney, on Friday.

In a statement posted to the ASX on Monday morning, ARN said the applicants claim the termination of Sandilands’ contract was “invalid” because there was no “act of serious misconduct or breach of contract”.

The termination was “unconscionable” under the Australian Consumer Law, the statement said.

“The applicants seek an order for specific performance of two contracts, payment of whatever amounts are due and payable under the contracts at the time of judgment, and damages.”

ARN said it disputes the claims and intends to defend the proceedings.

“Given the early stage of the matter, ARN is unable to reliably estimate the outcome or any potential financial impact,” the network said.

The once popular The Kyle and Jackie O Show came to a dramatic end following an on-air feud on February 23.

The confrontation began after Henderson read through Andrew Mountbatten-Windsor’s astrology chart in response to news of his arrest.

Sandilands criticised her “fixation” on astrology, saying it was affecting other parts of the show and claiming colleagues had raised concerns.

The discussion quickly turned personal, with Sandilands accusing Henderson of being “off with the fairies” and “almost unworkable,” while Henderson defended herself and described his comments were “unfair.”

The heated exchange ended with Henderson telling her co-host to “get somebody else” after what she described as a “total attack,” leaving her emotional as the show wrapped up.

KIIS FM has terminated Henderson’s contract after she told executives she “cannot continue to work with Kyle Sandilands” following the on-air spat.

Last week Sandilands’ $100 million contract was also terminated with the radio shock job accusing ARN of escalating the incident, claiming the network “decided to try and burn the place down” after the dispute.

“They sacked Jackie. They suspended me. They wouldn’t even let me pick up the phone to call her or anyone else on the show,” he said.

“Then … once they’d made it impossible for the show to go on, they turn around and say, ‘You didn’t fix it. You’re fired!’.”

The broadcaster said he had apologised to Henderson following the clash and was willing to return to air under any arrangement, including working with a different co-host.

“I said, ‘Put me back on air. I’ll work with Jackie. I’ll work with someone else. Whatever you need’ … Every single time — ‘no’.”

Sandilands had previously made it clear he intends to fight his termination.