Tim Stack
May 01, 2009 AT 04:00 AM EDT

Lost‘s island dwellers had reason to celebrate last week when the genre-defying hit aired its 100th episode. The milestone was marred, however, by news that a former production staffer, Chelsea Stone, has filed a sexual-harassment suit against Henry Ian Cusick (Desmond), along with the show’s Hawaiian production company and ABC. Stone claims she was groped by Cusick in 2007, and says she was fired for complaining. When contacted by EW, ABC had no comment; Cusick’s reps did not respond. — With additional reporting by Kate Ward

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