The actor, 38, spoke to ABC News this week, and didn't hold back when it came to his former 24 costar Kiefer Sutherland.
"I did 24, it was terrible," Prinze Jr. said of his 2010 gig on the hit FOX television show. "I hated every moment of it."
"Kiefer was the most unprofessional dude in the world," the '90s heartthrob added about 24's leading man, now 47. "That's not me talking trash, I'd say it to his face, I think everyone that's worked with him has said that."
Indeed, another one of Sutherland's 24 costars, Shohreh Aghdashloo, gave her two cents on the actor in June 2013.
"I'm afraid working with him proved to be hard," she told Fox News about Sutherland. "That young man was pretty angry. It wasn't just me, he was angry with others too. At the end of the day, I thought he must be angry with himself and that's how he projects it."
Sutherland's alleged lack of professionalism bothered Prinze Jr. so much that he considered giving up acting for a bit. "I just wanted to quit the business after that," he explained. "So, I just sort of stopped."
His hiatus turned out to be temporary, though. In recent months, Sarah Michelle Gellar's husband has beefed up his résumé, making appearances on Witches of East End, Bones, and the upcoming animated series Star Wars Rebels. See the latest pics of Freddie here.
Sutherland, for his part, has nothing but nice things to say about his former costar. "Kiefer worked with Freddie Prinze Jr. more than five years ago, and this is the first he has heard of Freddie's grievances," his rep tells Us Weekly. "Kiefer enjoyed working with Freddie and wishes him the best."
SEE ALSO: Everything You Need To Know Before Watching '24: Live Another Day'
