Though his entertainment career spans nearly a half-century, David Carradine really came to fame because of his role as the indisputably good-guy character Kwai Chang Caine in the 1970s television series "Kung Fu." (The show's first season has just been released on DVD.)

Some 30 years later, Carradine has returned as one of the baddest bad guys in movie history, the menacing and nasty title character in Quentin Tarantino's "Kill Bill," actually a pair of action/revenge thrillers.

But don't mention the bad guy thing to Carradine.

"I'd beg to differ there," he said, without the slightest irony. "Really, can any character really be called good or bad in a Quentin Tarantino film? You can call him the antagonist. But villain? Bad guy? I'd have to disagree with either of those descriptions."

Still, there's no denying that his character, known simply as Bill, has done some mighty villainous things. As the head of the Deadly Viper Assassination Squad, he's served as mentor and lover to the most promising of the group, whose code-name is Black Mamba (Uma Thurman), but who is known in the films as simply "The Bride."

But when she leaves the business to get married, Bill and the rest of his squad shoot up the wedding and leave the The Bride for dead — which sends her on a quest for bloody revenge.

"Hey, she made him mad," the 67-year-old actor said during a telephone interview from Hollywood. "And to be fair, she's done some horrible things herself. I guess if you want to call her the good guy you can, though,"

If Carradine seems a little defensive about his character, it's understandable. He says that playing the part and working with director Tarantino marks a highlight in his lengthy career. "You only get the chance to work with someone as brilliant and creative as Quentin once in your lifetime. And that's if you're extremely lucky. And needless to say, I've been extremely lucky. Quentin is nothing less than a visionary."

Actually, Carradine wasn't Tarantino's first choice. Warren Beatty was initially cast as Bill, though he eventually dropped out. "I'd heard that, but I also know that Quentin told me he wrote the part with me in mind all along. So you'd probably have to ask him what happened there. Maybe he thought I wouldn't do it. I'm just glad that things worked out in my favor."