"Doctor Who: Planet of the Dead" is the first of the 2009 Doctor Who specials, and follows the Christmas 2008 special "The Next Doctor". It is the first Who story available in high definition. Aside from that, "Planet of the Dead" is good but not very special. Compared, for example, to the 2007 Christmas Special "Voyage of the Damned", "Planet of the Dead" has a simpler and less original story, less interesting characters, and less excitement. It's not bad, and I enjoyed watching it, but it's not among the best episodes with the tenth Doctor.
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