- This creature was initially put on the Hall of Fame on October 15, 2008.
- It was then put on the Premium Hall of Fame on April 15, 2009.
- It moved from that Premium Hall of Fame on February 1, 2016 before being released on July 1, 2022.
- This creature's DMC-38 printing left its race off-center.
- This creature has an Alien version: Zabi Hydra, Evil Planet Lord.
- It also has a Fire Civilization Alien version: Mars Gil Hydra, the Explosive.
- This card shares part of its name with Hydra
, one of Pluto's five moons. In Greek mythology, Pluto was the ruler of the Greek underworld.
- This card also uses the 星 Kanji for Star/Planet in its name. However, this card was released in May 2004 while this discovery was made in May 2005.
| Dark Hydra, Evil Planet Lord |
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