TheHobbit: The Desolation of Smaug. Peter Jackson and Martin Freeman discuss the second installment in the Hobbit saga 13 December 2013. 4 minutes.
Yes- there are giant spiders in the film for a decent length of time. For a more detailed account (which contains some spoilers) see this IO9 article which sums up the first 20 minutes of the film. Despite your phobia, it would appear that these beasties are fantastic enough for you to brave them. After all, they don't really have any bearing
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