Gold Reinforcements
In the Sanctuary, Marin tells the Bronze Saint Shaina that a certain girl is Seika, Seiya's sister. Source: crunchyroll
Aired 02/05/2008EP 3 - Gold Reinforcements

2008
Saint Seiya: The Hades Chapter - Elysion
After the 12 Gold Saints sacrifice their lives to destroy the Wailing Wall, The Bronze Saints enter the deepest realm of the Underworld, Elysion, where they face off aganist Hades's two most powerful servants: The Twin Gods, Hypnos and Thanatos, before they can reach Hades for the final battle.