Card Appearances:Sandaion, the Timelord
- In episode 148, this card is shown in Z-one's explanation when he notes to Yusei Fudo that he figured out that Yusei is planning to wait and let the "Timelords" return to Z-one's Deck until Z-one doesn't have a "Timelord" monster in his hand, which would allow Yusei to attack directly with his Synchro Monsters.
- In episode 149, Z-one uses this card during his Turbo Duel against Yusei Fudo. He Special Summons this card, "Hailon, the Timelord", "Raphion, the Timelord," Gabrion, the Timelord", and "Michion, the Timelord" via the effect of "Endless Emptiness". Due to the latter card's effect, this card's ATK is reduced to 0. In the next episode, this card attacks directly. After damage calculation, this card's third effect activates, inflicting 4000 damage to Yusei, but Yusei activates the effect of "Synchron Keeper" from his hand, negating the effect of "Sandaion" and banishing "Synchron Keeper" and "Big Eater" from his hand and Graveyard in order to Synchro Summon "Power Tool Dragon" with its effects negated. After Z-one sends "Endless Emptiness" to the Graveyard in order to activate "Infinite Light", this card's ATK returns to 4000. In the following episode, "Shooting Quasar Dragon" attacks this card. The effect of this card activates, but "Shooting Quasar Dragon" nullifies the effect damage Yusei would have taken. Both battling monsters are then destroyed in a Double KO (as "Shooting Quasar Dragon" negates the effects of monsters that prevent themselves from being destroyed in battle). Yusei then activates the final effect of "Shooting Quasar Dragon" to Synchro Summon "Shooting Star Dragon". Later Z-one activates the first effect of "Sephylon, the Ultimate Timelord" to Special Summon this card, "Sadion, the Timelord", "Metaion, the Timelord", and "Sandaion, the Timelord" from his Deck and Graveyard with 4000 ATK. Due to the second effect of "Sephylon", it gains ATK equal to the ATK of all other Timelords on Z-one's side of the field. After "Sephylon" attacks and destroys "Shooting Star Dragon", Yusei activates "Converging Wishes" to negate the Battle Damage he would take and Synchro Summon "Stardust Dragon". Due to the third effect of "Converging Wishes", "Stardust Dragon" gains ATK equal to the ATK of all Dragon-type Synchro Monsters in Yusei's Graveyard. Yusei then activates the fourth effect of "Converging Wishes" to return "Ancient Fairy Dragon" to his Extra Deck and force "Sephylon" to attack "Stardust Dragon", but Z-one activates the fourth effect of "Sephylon" to banish "Metaion" from the field in order to prevent "Sephylon" from being destroyed and nullify the Battle Damage he would take. Yusei then activates the fourth effect of "Converging Wishes" to return "Life Stream Dragon" to his Extra Deck and force "Sephylon" to attack "Stardust Dragon", but Z-one activates the fourth effect of "Sephylon" to banish "Sadion" from the field in order to prevent "Sephylon" from being destroyed and nullify the Battle Damage he would take. Yusei then activates the fourth effect of "Converging Wishes" to return "Black Rose Dragon" to his Extra Deck and force "Sephylon" to attack "Stardust Dragon", but Z-one activates the fourth effect of "Sephylon" to banish "Gabrion" from the field in order to prevent "Sephylon" from being destroyed and nullify the Battle Damage he would take. Yusei then activates the fourth effect of "Converging Wishes" to return "Black-Winged Dragon" to his Extra Deck and force "Sephylon" to attack "Stardust Dragon", but Z-one activates the fourth effect of "Sephylon" to banish this card from the field in order to prevent "Sephylon" from being destroyed and nullify the Battle Damage he would take.
- In the third above-mentioned episode, this card is shown on the Kabbalah tree along with the other "Timelords" when Zone was about to Special Summon "Sephylon, the Ultimate Timelord".
