In this series, I'll outline both the finest performances by an actress and those given by an actor in a motion picture. The criteria concerns actors of both genders who are able to communicate an idiosyncratic and thorough understanding of how their characters feel toward, and relate to, the people and situations they are involved with. These performances are delivered in an entirely natural manner without unnecessary affectation or embellishment. Their preservation on film gives the viewer an opportunity to keenly scrutinise each thespian's work. Therefore, the acting must not only be appropriate for the cinematic medium (as opposed to a more emphatic stage delivery) but allow for new character revelations to be discovered upon repeat viewings.