S1·E12 Grab On! The Nebula Chain of Friendship

Seiya is suffering from Black Death's curse and is on the verge of death, while Hyoga tries (in vain) to defeat Ikki. Shun finds Seiya and tries to help him, but Black Andromeda and Black Dragon show up and Seiya makes a last sacrifice so Shun won't get killed. Shun manages to kill his black shadow and Shiryu appears and challenges Black Dragon. The combat between the Dragons is about to begin!