The Challenge from the Anti-Space (反宇宙からの挑戦 Han Uchū kara no Chōsen) is the fourteenth episode of Ultraman Gaia.
A wormhole near Jupiter sends Anti-Matter towards Earth. The potential reaction between it and normal matter could mean total annihilation. The Alchemy Stars work on a way to avoid this threat, but in the end it might take Gamu and Fujimiya overcoming their differences to protect the planet.
- 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!?."