Cheaters, Pt. 1

S3, E16: Grace (Debra Messing) is apoplectic when she catches Will's (Eric McCormack) philandering father (guest star and Oscar-winning director Sydney Pollack) on the arm of a glamorous stranger (guest star Lesley Ann Warren, "Victor/Victoria") but she gets even more worked up when she tells Will - and he's happy living with denial. Speaking of cheaters, Karen (Megan Mullally) misunderstands Grace and suddenly suspects that her husband Stan is having an affair, so she sets out to even the score. Sean Hayes also stars. Part 1 of 2.