The theme of good and evil in Robert Louis Stevenson's 'Strange Case of Dr Jekyll and Mr Hyde' explores the inherent conflict and intertwined nature of these opposing forces within human beings. It delves into the idea that humanity is composed of both virtuous and malevolent impulses, and examines the consequences of attempting to separate or suppress one side. Stevenson uses the characters of Dr. Jekyll and Mr. Hyde to personify this internal struggle, highlighting the dangers of unchecked evil and the societal pressures that contribute to its emergence.