Watch Young Justice S02E07
March 19: At Nightwing's request, Artemis rejoins the Team to help ensure the safe launch of one of Carol Ferris's communications satellites. The satellite is meant to strengthen relations between Earth and Mars, but Black Manta has sent Aqualad and his men to destroy it. Upon confronting the villains, Lagoon Boy is captured and shipped off to the ... (more)Light's Partner while Nightwing and Artemis deal with the ground assault. They soon find themselves up against Aqualad, who fails to destroy the rocket but kills Artemis with his water sword. The rocket explodes anyway, and the heroes are unable to save their fallen friend. March 20: Aqualad reports to Black Manta, who reveals that he had planted the bomb that destroyed the rocket in order to test whether his son would take credit for the victory or not. At Mount Justice, the Team mourns the death of Artemis. On the waterfront of Blüdhaven, Nightwing and Wally meet in secret with Aqualad and Artemis (whose death was faked). Aqualad's defection from the Team and 'killing' of Artemis was part of a ruse to ensure that the pair could go undercover to learn more about the Light and their Partner. Artemis is given an amulet (which Zatanna had made without knowing its purpose) that will disguise her looks to everyone except Nightwing, Aqualad and Wally, then she and Aqualad leave together.. You can watch Young Justice S02E07 here.