Kyle Sandilands and Jackie "O" Henderson are both being sued by their former employer ARN, after they lodged separate lawsuits following an on-air spat that led to their show being axed.
The pair are both seeking the full payout of the remainder of their 10-year, $100 million contracts signed at the end of 2023.
But ARN, the parent company of KIIS FM, has claimed the controversial pair cost the company key advertising revenue through their sacking.
By breaching their contract and making the future of their breakfast show untenable, both Henderson and Sandilands were liable for the subsequent loss of advertising revenue, the broadcaster said in documents filed in the Federal Court.
Audience share for the station dropped in the pair's old time slot in their primary market of Sydney, according to a ratings survey released on Thursday.
In its defence to Sandilands' lawsuit over his sacking, ARN told the court Henderson sent the station a letter in February claiming her co-host had engaged in "persistent and relentless bullying".
He allegedly made offensive comments to her in September 2025 that prompted her to raise a complaint with station staff.
"Don't f***ing bother coming back either until you get your f***ing shit together like a normal person," Sandilands allegedly told Henderson off-air.
"I've been carrying this whole show for f***ing a year."
Henderson alleged in court documents that she had complained to station management multiple times about comments by Sandilands over about six months.
Her case is being heard for the first time on Friday, setting up a potential showdown with her former colleague, whose case will also be looked at on the same day.
Sandilands allegedly said some of Henderson's comments were "weird, psychological bullshit", and her belief in "hype words" was negatively impacting her dating life.
But Sandilands' suit claims he did not deserve to have his contract torn up because he had not committed serious misconduct.
The highly public bust-up moved into the legal arena after an exchange between the star pair in February, when Sandilands accused his co-host of being "off with the fairies".
The on-air comments prompted Henderson to say she could no longer work with her contentious colleague.
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