which I guess there'd have to be since we the viewers presumably don't know about it in canon yet

Um, okay, bad phrasing on my part -- I should just have come out and said, "Secret superpower implies a power that the characters have always had, or at least for a long time. Can I submit one where they get a new superpower, on a mission or something like that?"

Just, you know, to clarify the question, not because I want you to make up a nitpicky definition. I think I've got a handle on what's acceptable now, and if in too much doubt, there's always the noticeboard. *g*