I don't know anything about Dexter but this is an interesting premise. I wondered how you could combine two shows with such different tones.

I like the idea that Dexter could pick up on something different about Clark:

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He's definitely hiding something, that much is clear to me. Most people might not notice it, but I'm not most people. The question is: what, exactly, is he hiding?
I also liked the way you resolved the story - that Dexter is surprised by the revelation that Clark is Superman. And that Dexter understands the importance of keeping certain secrets.

Entertaining story!

Joan