Star Power is pretty much a "Damage Modifier" when dealing with enemies. The goal being a dual-natured attribute of both the Actor's -professional- threat (as if it dips below zero the show loses budget) and being able to deal with monsters who are often pretty tough.
It's been a long time since I've gone over this game. Perhaps I should clean things up and finally integrate some ideas from its "Sequel" game. That wouldn't be entirely remiss idea. Thank you for the comment, I'll see what I can do.