'Reservoir Dogs' and 'Incredible Hulk' star Tim Roth is taking the leap to the small screen this January in "Lie to Me," a new FOX drama series from Oscar-winning producer Brian Grazer, and ET is on the set with the cast! Tim tells us about the real-life inspiration for his character -- and why his kids may never be able to lie to him anymore!

"The guy I play is based on a man named Paul Ekman, who studied body language and traveled the world, and studied different cultures and came to the conclusion that it's universal; it's not cultural-specific," says Tim. "Your face contradicts what you're saying and it's involuntary, the gestures you make with your face -- and he can read them."

In "Lie to Me," Tim plays Dr. Cal Lightman, a man with the uncanny ability to detect the truth by analyzing a person's face, body, voice and speech. While his unique skill helps criminal investigations, it has its negative side when it comes to his private life.

"I've learned a little bit -- whatever's necessary for the episode … but I don't really want to know [more]," says Tim. "He wrote a book about why kids lie, and that's tempting to get that one."

Watch ET for more with Tim Roth and "Lie To Me."