Plot summary
M'gann returns to Happy Harbor and learns about Garfield's depressive state. She recruits teammates and friends to convince him to seek help, but Garfield rejects them, claiming he does not need help. However, M'gann informs Garfield that he has to attend a mandatory mental health check with Black Canary, or he will be dismissed from the team. In Poseidonis, Arion gains popularity among the citizens. King Arthur sends Kaldur on a mission to find the Crown of Arion, which was lost in the ruins of Atlantis when it was sunk.
While Kaldur, Wyynde, La'gaan, and Delphis sneak into Xebel during the unrest, King Arthur visits Ocean Master and realizes he is a clone. As Conner carries Phantom Girl, he starts to hallucinate about his life and spots the school bus, which Klarion has made his vessel. He pleads for help, but is unheard. In a mid-credits scene, Forager delivers the valedictorian speech during his and Halo's graduation.
Credits
Adapted from Wikipedia contributors, List of Young Justice episodes. HTML formatting and reference markers removed.