Card Trivia:The Tyrant Neptune
- This card is based on the planet Neptune, the eight planet in the Solar System.
- This card's WATER Attribute is a reference to how Neptune was named after the Roman god of the sea.
- This card's Attribute is also a reference to the Japanese name for Neptune, "Kaiousei" (海王星), which translates to "Sea King Star".
- This card's WATER Attribute is a reference to how Neptune was named after the Roman god of the sea.
- This is one of the few cards in the OCG whose Japanese name consists of only English alphabetical characters and punctuation, excluding furigana characters. Other notable examples include "Destiny HERO - Plasma", "Destiny End Dragoon", "Assault Revival", "NEX", "ZERO-MAX", and the other Legendary Planet cards (except "Elemental HERO Terra Firma").
- This is the first and currently only Legendary Planet card to become Forbidden.
