Doug Ballard

Leo fears the worst when he testifies in the congressional investigation into Bartlet's lack of public disclosure about his illness.

The full moon and festivities prompt strange happenings including Blanche's jewelry being swiped, Sophia trying to break a curse and Dorothy and Miles sharing a passionate kiss.

Grace (Debra Messing) discovers that one of Karen's (Megan Mullally) friends is the notorious Helena Barnes (guest star Joan Collins, "Dynasty"), one of New York's most-celebrated interior designers, and her primary competition for a lucrative design job. Meanwhile, Jack (Sean Hayes) might regret it when he convinces Will (Eric McCormack) to help him try to obtain financing for his latest venture, The Subway Tush - a portable seat to make subway rides comfy.

The Cohen family prepares for a visit from Sandy's mother, Sophie (Linda Lavin - "Alice"), for Passover dinner. Fearing that his grandmother will not approve of Summer, Seth tries to keep the two from encountering each other--but Summer sets out to prove him wrong. Meanwhile, Ryan desperately searches for Marissa, who disappeared when she found out about Luke and Julie's affair.

After Luke gets into a near-fatal accident, Marissa and Ryan decide it is time to hear what he has to say; just prior to the Lighthouse's opening, Jimmy and Sandy find out their liquor license has been denied; Caleb proposes to Julie.