Charlie Sheen's 'Anger' expected to endure

Charlie Sheen's rebirth on FX sitcom "Anger Management" is likely to have staying power. And his dad Martin's guest-starring turn will turn into a recurring role for the bulk of the show's run, where he plays Charlie Goodson's dad Martin.

"He did an episode of 'Spin City' with me, and 'Two and a Half (Men),' and we figured he should be on this," Sheen says. "He brings a whole different energy," Sheen says.

In an unusual arrangement, "Anger" will trigger a 90-episode renewal if an undisclosed ratings threshold is met in the final eight episodes of its current 10-episode season. Based on current numbers (six have aired), "the odds are overwhelming that it will ultimately earn that renewal," says FX chief John Landgraf. The series will film at the very brisk pace of about two episodes a week: "There's literally no rehearsal," says executive producer Bruce Helford. "It's all gut."

Asked again to reflect on the turmoil that led to his firing from CBS' "Men," Sheen said he was tired of revisiting the subject. But "life's different now; I'm not insane anymore."