Episode Title:Flush, Flush, Sweet Helga.Episode Description:When Milo and his friends get caught crashing a Debbie birthday party, Helga ends up losing Debbie's locket and goes in the sewers to retrieve it, only to be stuck in the Valley's sewer pipes, and the Hill people don't see it as a problem -- until a failed attempt to get Helga out results in the Hill people annexing The Oblongs' house (which isn't affected by Helga being stuck in the pipes) for water.