Legendary Planet

The Planet Series is a major plot point from the Yu-Gi-Oh! GX manga. It consists of eight powerful cards, each analogous to one of the planets in the solar system. The cards are named accordingly, with all of them possessing some sort of reference to their respective planets within their names and card arts. Unlike similar series of cards, like the Egyptian Gods or the Sacred Beasts, the Planet Series do not appear to have any sort of inherent magical or ancient quality to them; although Tragoedia shows interest in them while possessing David Rabb, they take backseat in his priority list to the card spirits Light and Darkness Dragon and Winged Kuriboh. Six of the Planet Series have been revealed thus far.

In the OCG/Japanese manga, the Planet series naming convention is The (adjective) PLANET (with the exception of Terra Firma, who's OCG name is E Hero The Earth). In the English manga, the word "the" is removed, whereas in the TCG, with the exception of Venus, the names are kept the same as the OCG name. Terra Firma's name has also been changed from Earth for unknown reasons.

In the GX Manga, Alexis Rhodes has faced many of the revealed Planet cards, and she has lost each match when she faced one. In her match with Jaden Yuki, she fought Terra Firma. Against David Rabb, she lost to the The Big Saturn. And she also lost to Reggie MacKenzie, who used Splendid Venus. The 4th monster of this Archetype, "The Tyrant Neptune" is used by Jim Crocodile Cook in his duel against Atticus Rhodes. But unlike his sister, Atticus won his match against a Legendary Planet. The 5th monster, "The Despair Uranus" is used by Adrian Gecko against Jaden Yuki after he is possessed by Trageodia."The Tripping Mercury", the 6th Planet monster is used by Jesse Anderson to defeat Syrus Truesdale.

All Legendary Planets except Earth/Terra Firma have their Japanese names written in English letters.

In GX Chapter 54 Aster Phoenix was given the last card of the planet series by Principal MacKenzie.

Atticus might have one of the 2 remaining planet cards since it's highly possible that he is possessed by Trageodia after his defeated by Aster Phoenix and was given to by Principal MacKenzie.

The remaining 2 planets left are Mars and Jupiter. Unknown yet which planet card was given to Aster.

Since the Legendary Planets are based on the current Solar System, Pluto is excluded.