On the finale to the second season of Dan Schneider’s “Henry Danger,” “I Know Your Secret” puts Henry’s job in serious jeopardy. After he gets a cryptic message in his locker claiming someone knows his secret, Henry, thinking someone knows he’s Kid Danger, spends the rest of the episode trying to find out who it is. We won’t give too much more away in case you haven’t seen it yet. Let’s just say that all these events culminate in an emotional ending that changes the world of “Henry Danger.”