Question: Which TV show had an episode "Treehouse of Horror XVII" between September 23,2007 and May 18, 2008?
Sentence (from "List of The Simpsons Treehouse of Horror episodes"): These segments usually involve the family in some horror, science fiction, or supernatural setting and always take place outside the normal continuity of the show and are therefore considered to be non-canon. "
Relevant evidence: No