S4, E9: Rather than be apart on Thanksgiving Day, Will (Eric McCormack) and Grace (Debra Messing) join Jack (Sean Hayes) and Karen (Megan Mullally) for a festive holiday motor tour of their respective dysfunctional families, including Grace's domineering mother (guest star Debbie Reynolds) as well as Will's willful mom (guest star Blythe Danner, "Meet the Parents") and Jack's step-dad (guest star Beau Bridges) - with unsettling results. Meanwhile, back home, a waiting Rosario (Shelley Morrison) bastes and tastes their juicy turkey. Helen Slater ("City Slickers"), Jon Tenney ("Brooklyn South"), Lainie Kazan ("The Nanny") and Kenneth Mars ("The Producers") also guest star as other bizarre family members. Part 1 of 2.