As Dee Dee enters the lab, she sees your containment cell, which had no windows or visible doors and the monitor to it was off, you are one of Dexter's new creations, and she sees a button next to your cell, you hear her say "Ooh! What does this button doo?" despite protest from her brother not to push it, she pushes the button anyways, causing the containment cell you were in to expose you to the view of Dee Dee