Aqualad (real name Kaldur'ahm) is the former protégé of Aquaman and the leader of Young Justice.
He first appears with Superboy and Miss Martiann and they defeat the H.I.V.E. Later on Robin attempts to speak with Aqualad but he states the Titans are nothing more than a disgrace to the hero name and after a few short instances from the titans his points is proven true. He then leaves the area with his team. His words later prompted the Titans to get serious and become a more efficient Team which would later helped them as they were able to defeat the Hive and destroy a powerful missile. Aqualad and his team who had arrived to clean up the Titans mess witness this and he praised them for their hard work and this had robin ask him if he could admit that he misjudge them. Aqualad said they did look pretty serious now but worried if they were too serious only to be silenced by Cyborg who angrily told and showed him he no idea how painful it was to be part human/robot.