Catch up TV on Young Justice. Watch the latest and all other episodes of Young Justice now online, broadcasted on Channel 9. Catch up on your favorite Channel 9 TV show: Young Justice. Replay tv on its best! In Young Justice, being a teenager means proving yourself over and over - to peers, parents, teachers, mentors and, ultimately, to yourself. But what if you're not just a normal teenager? What if you're a teenage super hero? Robin, Aqualad, Kid Flash, Superboy, Miss Martian and Artemis will found out whether they have what it takes to be a proven hero.