Young Justice was formed when teen heroes Robin (Tim Drake), Superboy and Impulse helped rescue a mysterious girl, 'the Secret', from the captivity of the Department of Extranormal Operations (D.E.O.). They decided to form a team; Young Justice.
Young Justice began operating out of the Justice League's abandoned Justice League Cave, renaming it the 'Justice Cave'. The team had the approval of the Justice League and Red Tornado became their mentor.
The team grew to include many of DC's teenage heroes.
In a battle with Indigo, an android from the future, Empress, Argent, Cyborg and Jesse Quick are hospitalised. The android activates a dormant - and hostile - Superman replicate android that had been left in the care of STAR Labs. The resulting battle leads to the death of long term Titans, Lilith and Donna Troy. The team is devastated by the loss, and the Young Justice team dissolves.