The Incident

In the world of Young Justice, Jason Todd was the second Robin after Dick Grayson. But Jason didn't last very long, dying in the line of duty. His death is still raw, being only months since it happened when The Incident occurs...

In a distant dimension, Jason Todd is the Red Hood, leader of the Outlaws, a band of misfits that consists of an alien princess named Koriand'r and Arsenal, the best tech guru around. It is this very tech guru and his various miscellaneous projects that leads Red Hood and the Outlaws to The Incident...

Or in which Red Hood and the Outlaws end up in the world of Young Justice.