A rival of Howard Stern has unearthed allegedly shocking and “evil” behavior the iconic radio host displayed years ago while working in the Chicago market in the mid-to-late 1990s.

Stern allegedly made extremely distasteful comments about the terminal cancer stricken father of competing host Mancow Muller, saying he planned to “dig up his corpse” and allegedly threatened to rape Mancow as well, the Daily Mail reported of Muller’s commentary in an episode of “Dark Side of the 2000s” on Vice, premiering Tuesday.

“He was gonna use my mother’s saliva on himself when he raped me, how he was gonna dig up my father’s corpse, he told his listeners to go to my father’s funeral,” Mancow claimed.

“My father was a $30,000 a year cabinet maker and he became the No. 1 topic on Stern’s show for a year…The countdown to his death, how he was going to have sex with my mother.”

Stern reportedly would call Mancow his “b–ch” on air and is accused of saying things like “they should have shot your father” as well.

The Post reached out to a Stern representative for comment.

Meanwhile, even Stern’s own staff supposedly acknowledged the host crossed a distinct line in the heated rivalry.

“His people called me and apologized,” Mancow said. ” ‘I didn’t write this, this isn’t funny,’ they would tell him: ‘Howard, you’re gonna lose them, this is a mistake!’ “

Jackie Martling, a former head writer of the show added that “It was ruthless, [Stern would] start saying horrible things. I didn’t want anybody to think that this is my concept.”

Stern then allegedly took things past the point of vile verbal commentary as he sent Mancow a pink dress “as a symbol that he had been emasculated.”

“What we did is we got everybody in the station to defecate in the box and we sent it back to him,” Mancow said of his retaliation.

Despite the proverbial casualties of their battle, Mancow maintains that he won the war for Chicago’s listeners after the two had it out with an on-air shouting match.

“It was the greatest battle in radio history and the people of Chicago went ‘click’ and they turned him off,” Mancow said. “It destroyed him in Chicago, he never beat me in Chicago, he never came close. Turns out there was more people in Chicago that had good in them, and good actually won for once.”