Peter Gallagher looked to be having a blast as Sandy Cohen on The OC. He was likely the most consistently entertaining aspect of that former Fox show.

But the actor says no role has ever been more enjoyable than the one he just finished shooting, as Stacy Koons on season three of Californication.

"I'm playing... the dean of the university where Hank Moody works. Embeth Davidtz plays my wife, Felicia Koons. I'm fairly antagonistic with Mr. Duchovny. I had the time of my life - about as much fun as any actor is allowed to have," Gallagher told E! News.

Other guest stars on Californication this fall include:

• Kathleen Turner as an evil agent;
• Rick Springfield as a drug-addicted star;
• Diane Farr as Hank's T.A.;
• Eva Amurri as a stripper/student;
• Ed Westwick as a student.

Season three premieres on September 27. Check out a trailer for it now.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.