While promoting his new animated series, 'Star Wars Rebels,' at the 2014 Comic-Con, actor Freddie Prinze Jr. revealed his grievances toward co-star Kiefer Sutherland while they were working together on the show '24.'

It seems that actor, Freddie Prinze Jr., seems to have 5-years' worth of pent-up grievances against actor Kiefer Sutherland.

While talking to ABC News during his appearance at the 2014 Comic-Con, Prinze Jr. revealed that he "hated" working with Sutherland after being asked how working on '24' was like.

"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 working with him has said that," Prinze Jr. revealed during the interview, as reported by Fox News.

The "She's All That" actor went on to describe his newer career endeavors, such as working for WWE's Vince McMahon.

Prinze then divulged how the producers would make him remove his shoes while filming scenes with Sutherland, so as to create a taller image for the lead actor.

"It was a crazier job than working with Kiefer, but, at least he was cool and tall. I didn't have to take my shoes off to do scenes with him, which [the "24" producers] made me do. Just put the guy on an apple box or don't hire me next time. You know I'm 6 feet and he's 5'4," Prinze Jr. said unapologetically.

A representative for Fox responded to the actor's claims in defense of Sutherland. To the contrary, the Fox executive told TMZ that Sutherland was "nothing but professional during the run of the show and is beloved by cast and crew."