: A bad guy who pretends to be a good guy.
- Straight: Most people assume Bob is a good guy, until The Reveal when it turns out he was a villain (or working for them) all along.
- Downplayed: Bob isn't a villain as such, but his agenda is different than the one he pretended it was, and it isn't in the best interests of the good guys.
- Bob is a mole because he's being blackmailed or coerced.
- Bob has good reason to dislike the good guys.
- Inverted: Bob is a Reverse Mole.
- Subverted: Bob is revealed as a mole, but then it turns out to be someone else framing him. See Red Herring Mole.
- Double Subverted: Bob is revealed as a mole, then it turns out to be someone else framing him, but at the end Bob really is the mole after all.
- Zig Zagged: Bob is set up as the mole, but turns out to be a Double Agent. The guy framing him is actually the mole, but working for a third side. Then the protagonist ends up being a mole too.
- Averted: There are no moles — everybody's on the side they claim to be.
- Enforced: In any work set during the Cold War, it's well known that both sides employed moles, so there pretty much has to be one.
- Lampshaded: "There's always a mole in these stories. And it's always the person you least suspect."
- Invoked: "We've got to plant a mole in their team; it's right there in the Spies Handbook."
- Exploited: ???
- Defied: "There's no mole among us; the psychometer would ferret one out in an instant."
- Discussed: The characters talk about how likely it is that there will be a mole, given the political situation.
- Conversed: "I knew he was a bad guy!"
- Deconstructed: The psychological aspects of being a mole are discussed. We see the angst Bob suffers over having to betray the people he befriended.
- Reconstructed: Bob is the focus character, or even the protagonist. His backstory and psychological issues are studied; he has an opportunity to make a Heel-Face Turn... but doesn't. In the end, he carries out his betrayal exactly as planned, surprising everybody.
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