Part domestic drama, part satire, part science fiction and part philosophy debate, celebrated gay playwright Edward Albee’s Seascape tells the story of Nancy and Charlie, a troubled, aging American couple facing tensions in their relationship as they contemplate retirement. Their visit to a beach on Long Island is enlivened by the unexpected appearance of another couple, Leslie and Sarah, who are actually large, scaly, humanoid sea-lizards, highly-evolved and considering a life-altering move from the ocean to the land. The 1975 play won Albee the second of four Pultizers for drama, and it finds the generally acerbic and pessimistic playwright in an upbeat and playful mood. Through Aug. 22. American Century Theater, Gunston Arts Center Theater II, 2700 S. Lang St. Arlington. Tickets are $28 to $32. Call 703-998-4555 or visit www.americancentury.org.