ROBERT DELIVERS AN ULTIMATUM, ON ABC'S "BROTHERS & SISTERS"

Tom Skerritt Reprises His Guest Starring Role as William Walker

"Let's Call the Whole Thing Off" � When Kitty and Robert reach a crossroads in their marriage, she is forced to reflect on her father's (guest starring Tom Skerritt as William Walker) past indiscretions and decide what's most important in life. Meanwhile, Ryan makes a discovery about his mother's death and takes a huge leap in the wrong direction to vie for Rebecca's affection, on "Brothers & Sisters," SUNDAY, MAY 3 (10:01-11:00 p.m., ET) on the ABC Television Network.

"Brothers & Sisters" stars Dave Annable as Justin Walker, Maxwell Perry Cotton as Cooper Whedon, Kerris Lilla Dorsey as Paige, Sally Field as Nora Holden, Calista Flockhart as Kitty Walker, Balthazar Getty as Thomas Walker, Rachel Griffiths as Sarah Whedon, Luke Macfarlane as Scotty Wandell, Rob Lowe as Senator Robert McCallister, Sarah Jane Morris as Julia Walker, Matthew Rhys as Kevin Walker, Ron Rifkin as Saul Holden, Emily VanCamp as Rebecca Harper and Patricia Wettig as Holly Harper.

Guest starring are Tom Skerritt as William Walker, Luke Grimes as Ryan Lafferty, Matt Letscher as Alec Tyler, Luc Charbonnier as Ben Tyler, Jay Knowlton as Grady and Toby Holguin as the bus driver.

"Let's Call the Whole Thing Off" was written by Peter Calloway and Daniel Silk and directed by Laura Innes.

The series broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound and Spanish subtitles via secondary closed captioning. A TV parental guideline will be posted closer to airdate.

This episode will be available on ABC.com the day after airing on the network for users to watch online.