Danny The Youngest

Danny Phantom had grown up in the human world but has been adopted of sorts by Martian Manhunter. The Martian had taken a growing interest in the boy when he found him sobbing in an alley way. He had to spend a while calming the young toddler down before taking him back to his own planet. Now a year later. Danny's joining the Young Justice team.
( In this story Danny is three when he meets Martian Manhunter and is four when it starts off. Any more questions? Read the story )