The heroes encounter a situation where the villain is an imposter of one of their own and/or a sympathetic character. The heroes must find out about the imposter and expose him/her to stop him. Typically, the situation will involve the impostor and the real person standing side-by-side, both claiming to be the real one, and the other heroes must use their wits to identify who is who, usually by finding a quality that the faker doesn't have (in comedic examples, a positive quality). Or the real person may ask that their friend shoot both of them just to guarantee they get the imposter (and it's almost inevitable if the person has a super-healing power), which usually results in the heroes shooting the other one, because the impostor wouldn't be noble enough to suggest making the Heroic Sacr