Freddie Prinze Jr. hated working with Kiefer Sutherland on 24.

“I did 24, it was terrible. I hated every moment of it,” Prinze told ABC at Comic-Con. “Kiefer was the most unprofessional dude in the world. That’s not me talking trash, I’d say it to his face, I think everyone that’s worked with him has said that.”

Prinze also told ABC that his experience working with Kiefer was so bad that he wanted to quit acting.

Kiefer’s rep, however, says the 24 star isn’t sure what Prinze is talking about.

“Kiefer worked with Freddie Prinze, Jr. more than 5 years ago, and this is the first he has heard of Freddie’s grievances,” the actor’s rep told ABC News.

Louis Lombardi, who also appeared on 24, sides with Kiefer, telling Us Weekly that his “experience with Kiefer was absolutely the opposite.” Unlike Prinze, Lombardi called Kiefer “one of the most professional actors I’ve ever worked with.”

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