'The Big C': Susan Sarandon as a 'joyologist' pictures

"The Big C" is continuing its tradition of welcoming big name guest stars. Susan Sarandon is the latest Hollywood A-lister to join the Showtime dramedy. She debuts in the third episode of Season 3, titled, "Bundle of Joy," for a multi-episode arc.

The episode sees Cathy (Laura Linney) meeting Sarandon's character, the aptly named Joy the joyologist, at a creative retreat. Joy is a cancer survivor whom Cathy ends up befriending. Joy uses her cancer experience to inspire others and motivates Cathy to get more out of her cancer experience.

We hope that means Cathy stops with the day drinking. Drunk, belligerent Cathy isn't that much fun. And we bet Sarandon is just a hoot in this role. "The Big C" airs Sunday nights on Showtime.