The Door of Change (革新の扉, Kakushin no Tobira) is the twenty-first episode of the Second Season of Mobile Suit Gundam 00.

The Ptolemaios 2 has received a message containing coordinates for a point at Lagrange 5. The crew are suspicious, but Setsuna suggests they set course for this mysterious location. Ian Vashti agrees, since this will enable them to collect new equipment from Celestial Being's nearby secret factory. Meanwhile, Hiling Care and the other Innovators are vexed by the power of the 00 Raiser, which they now suspect is due to more than just the capabilities of the mobile suit itself.

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