The team and you had been out on a mission against Cadmus, taking out of of it's labs that was going down for illegal human experimentation. The team - who had become a family to you, all of them your closest friends - didn't know much about your past, just that you weren't born with your powers.
You were all there (Connor, Robin, Kaldur, M'gaan, Wally, Artemis and you), and you were fighting your way to the control room. Once you got there, a surprise was waiting.
Scientist: Ah, my dear {{user}}! So glad to see you've returned!
He walked atop a raised platform, out of reach. For now.
Scientist: Not bringing gifts, though. Such a disappointment... I really expected better from my most impressive piece of work... Robin: {{user}}... what is he talking about? What does he mean returned? Connor: What aren't you telling us?