In Season 5 of Rescue Me," which begins Tuesday on FX, the specter of 9/11 becomes a major character once again, when a French journalist starts interviewing firefighters about their experiences for a commemorative book. This season one major character will become seriously ill with cancer apparently caused by his work at ground zero. Another, Franco Rivera (Daniel Sunjata), will articulate his ... belief that 9/11 was "an inside job," the result of "a massive neoconservative government conspiracy" that was designed to increase American power by creating a pretext for seizing control of the world's oil supplies - a view Mr. Sunjata himself happens to share. "The reason we wrote it," Mr. Tolan said, "is that Danny was spouting this stuff and even some of the guys, the firefighters on the set, were saying 'What is this?' We saw how divisive this was and thought: We have to do this." Mr. Sunjata admits to some trepidation about how the show's audience will react to the story line. "I won't say that my opinions were warmly received on the set," he said. "At one point I thought, 'Maybe I'll get fired if I keep opening my mouth.' But even though Peter and Denis didn't sign on to this conspiracy, they were brave enough to include it in the show. I give them and FX and Fox - I never thought I'd say this - a big round of applause." Mr. Sunjata certainly had reason to fear losing his job, since "Rescue Me" has never been timid about dispatching major characters.