Harry is the main character in the series, not a guest
character. He appears in all seven books.
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Here's Lucy - 1968 Lucy's House Guest Harry 3-20 was released
on:
USA: 25 January 1971
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The cast of The History of the SF Film - 1982 includes: Harlan
Ellison as Guest Richard Fleischer as Guest Harry Harrison as Guest
Forrest J Ackerman as Guest Ridley Scott as Guest Douglas Trumbull
as Guest Robert Wise as Guest
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Eldred Worple, a guest at Slughorn's party who tried to convince
Harry to let him write his biography.