The Challenge from the Anti-Space (反宇宙からの挑戦 Han Uchū kara no Chōsen) is the 14th episode of Ultraman Gaia.
- Ultraman Gaia Volume 4 features episodes 13-16.
- Antimatter 's appearance is based on the kaiju Pestar.
- This episode was later featured in Ultraman Retsuden episode 45, "Challenge from Anti-Space! Gaia vs. Agul!?."
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