'''Basic Trope''': A bad guy who pretends to be a good guy.
* '''Straight''': Most people assume Bob is a good guy, until TheReveal when it turns out he was a villain (or working for them) all along.
* '''Exaggerated''':
** Everybody in the story is [[FlockOfWolves secretly working for someone else]].
** Bob is [[ChronicBackstabbingDisorder working for more sides than he can keep track of]] at any given time.
** Bob is [[MoleInCharge the leader of the heroes]].
* '''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.
* '''Justified''':
** Bob is a mole because he's being blackmailed or coerced.
** Bob has good reason to dislike the good guys.
* '''Inverted''': Bob is a ReverseMole.
* '''Subverted''': Bob is revealed as a mole, but then it turns out to be someone else framing him. See RedHerringMole.
* '''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.
* '''Parodied''':
** Bob is [[MostDefinitelyNotAVillain so obviously a mole]] that it's ridiculous nobody else notices. For example, in a FunnyAnimal work, he is literally a [[http://en.wikipedia.org/wiki/Mole_(animal) burrowing mammal of the family Talpidae]].
** Rhe mole has a large brown [[http://en.wikipedia.org/wiki/Mole_%28skin_marking%29 melanocytic nevus]] on his face or elsewhere on his body, a la ''Film/AustinPowers''.
* '''Zig Zagged''': Bob is set up as the mole, but turns out to be a DoubleAgent. 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 ColdWar, 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 HeelFaceTurn... but doesn't. In the end, he carries out his betrayal exactly as planned, surprising everybody.
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%% Optional items, added after Conversed, at your discretion:
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%%* '''Implied''': ???
%%* '''Plotted A Good Waste''': ???
%%* '''Played For Laughs''': ???
%%* '''Played For Drama''': ???