Dark Link is a recurring antagonist from The Legend of Zelda franchise. He is a doppelganger of Link, born from the darkness in his heart, and has appeared in several games throughout the Legend of Zelda series. As Link's dark clone, he is able to use many of Link's own techniques against him. Physically, he resembles Link, but with clothing, skin, and hair that are varying shades of dark gray or black, and his eyes glow red.
Dark Link made his first appearance in Zelda II: The Adventure of Link as the game's final boss. He spawns from Link as he enters the final chamber, and serves as a the last trial in Link's way before he can claim the Triforce of Courage. In his original appearance, Dark Link appears as an entirely black silhouette of Link.
The Legend of Zelda: Ocarina of Time
Dark Link appears in Ocarina of Time as a sub-boss in the Water Temple. He acts as a guardian of the temple's treasure, the Longshot.
The Legend of Zelda: Twilight Princess
Multiple Dark Links appear in Twilight Princess in a flashback cutscene in which Lanayru tells Link of people that once attempted to conquer the Sacred Realm. These Dark Links are not specifically representative of Link, however, and are presented for illustrative purposes.
In Hyrule Warriors, the sorceress Cia lays a trap for Link, and uses his overconfidence against him by targeting the darkness in his heart to create multiple Dark Links. Link must fight them off, but they eventually gain the upper hand. However, his friends come to his rescue, and through his realization of the strength of that friendship, the Dark Links are vanquished and the Master Sword awakens to its full power.
Super Smash Bros. Series
Super Smash Bros. Melee
In Super Smash Bros. Melee, Dark Link appears in Event 18, "Links Adventure" in reference to his original appearance in Zelda II. In this event, the player must battle a Level 9 A.I. Dark Link.
Super Smash Bros. Brawl
Dark Link is a available as an alternate costume for Link in Super Smash Bros. Brawl, the costume is based off Twilight Princess style visuals. There is also a Dark Toon Link costume for Toon Link. Dark Link again appears in Event 18, "Dark Link Duel". In Co-op Event 7, "Battle of the Dark Sides", Link and Samus team up to take on Dark Link and Dark Samus.