Sentence:  It was just <WSD>Wonder Woman</WSD> whose secret identity threatened to overwhelm and swallow up the heroic reality. I think I was afraid that one day I'd innocently open that month's comic and find Diana Prince waking up to announce that <WSD>Wonder Woman</WSD> was only a dream after all. 
Meaning of the word marked with <WSD> tags:  A (DC Comics) superheroine. (from 1941.)