This article aims to show how the discipleship in the gospel of Mark arises before any rituality, which leads us to return to the previous and very important notes of the Christian Adults Initiation Ritual and to the catechumenal processes. Mark, without using the expression, narrates the disciples' journey as a catechumenate procedure in which Jesus is the master catechist. To this end, starting from the deuteragonist characters, i.e., the disciples, it is possible to verify which part of the baptismal process is revealed by the evangelist, because it is a process that is at stake. The disciples are involved in a catechumenate by the master catechist, Jesus. This is a journey that goes through the entire second canonical gospel. This makes the discipleship in Mark a catechumenate, which, from the part of Jesus is a procedure of familiarization.