The Fourth Symphony of a Nightmare (悪夢の第四楽章 Akumu no Daiyon Gakushō) is the thirty-seventh episode of Ultraman Gaia.
- Ultraman Gaia Volume 10 features episodes 37-40.
- At the end Hiroya meets up with the same girl he saved in episode 20.
- This is the last Mezard to appear.
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