A coming episode of the acclaimed FX drama “Rescue Me” will tackle what may sound like a far-fetched plot line: that the attacks of Sept. 11 were an “inside job.” The actor who espouses the theories on camera, it turns out, also subscribes to them in real life.

Claims that Al Qaeda terrorists were not solely responsible for the attacks have a lively following on the Internet, including on YouTube, but the second episode of “Rescue Me’s” fifth season, starting in April, may represent the first fictional presentation of 9/11 conspiracy theories by a mainstream media company (FX is operated by the News Corporation).

“They’re not discussed a lot in the press,” Daniel Sunjata, the actor who plays Franco Rivera on “Rescue Me,” told reporters at a television press tour last month. He predicted that the episode would be “socio-politically provocative.”