Antonin Artaud understands cruelty as necessity and rigor, animplacable and irreversible inner resolve to turn man into a lucid being who is able to give birth to a new theatre. In line with these ideas, this essay begins with the experiences of acting in and directing theatre to understand that the act of portraying an “other” subject requires to end the separation between the body of the actor and the fictional body of the character, an experience of dissolution. This shift from one to the other requires a Third Body, one that makes it possible to think about and materialize scenes that took place long before that body came into existence. The essay ends with a reflection on Alfredo Castro’s work as an actor in threefilms by the acclaimed Chilean director Pablo Larraín.