(Linda Lavin) guest stars as Sophie Cohen, mother of Newport lawyer Sandy Cohen (Peter Gallagher) and grandmother -- or "nana" -- of Seth Cohen (Adam Brody). Arriving at her son's house with some sad news for Passover, Mrs. Cohen has a galvanizing effect on Seth's girlfriend, Summer (Rachel Bilson), who is worried that "Nana" will hate her on sight. Elsewhere, Jimmy (Tate Donovan) draws closer to Hailey (Amanda Righetti), and Marissa (Mischa Barton) goes into hiding after finding out the truth about Julie (Melinda Clarke) and Luke (Chris Carmack). ~ All Movie Guide