Where --- rather than an undercover agent's getting a crime-organization to accept him into their group so that he can collect evidence to bust them --- a BAD guy surreptitiously sneaks his way into a GOOD organization in order to pilfer items and/or sensitive information from them merely to use for his own benefit.
Doc Brown kind of "played both sides of the fence" when he managed to infilchrate the Libyan terrorist group --- yes, he was indeed a "good guy" who was getting a bunch of evil men to trust him, although admittedly he was indeed there to dishonestly rob them of their bomb-making material. However, he was not stealing the plutonium to use for financial gain or a nefarious purpose, and thus he was not exactly being a "bad guy", either --- he was merely wanting to do something beneficial and progressive for mankind (i.e., invent a time machine), plus of course his relieving the hotheaded Arab crooks of their dangerous radioactive loot prevented them from using said fuel to make a bomb to hurt people, so that was a good thing, as well.
by QuacksO August 26, 2019