This is a study of D. B. Z. Ntuli's radio trilogy: 'Isivumelwano', 'Isivumelwano Esisha' and 'Ngenxa Yesivumelwano'. Since the term trilogy is not a familiar concept in Zulu literary studies, this is an attempt to fill that void. This thesis provides some new insight into this concept, while also devising a practical method for the analysis of the radio trilogy. Chapter one outlines the aim of the study, scope of the study and the definition of some terms. This is followed by explaining the method of research and theories on radio serial dramas. There is also a discussion of the historical background in the development of Zulu radio serial drama and Ntuli's position and contribution to it. Finally, there is a review of previous research studies in African Languages on radio drama. In chapter two plot structure of a radio trilogy is discussed. Theories of drama trilogy by trilogists like Hitchcock, Bakhtin, Asimov and Norris are discussed in detail. This is followed by an in-depth analysis of the plot structures of 'Isivumelwano', 'Isivumelwano Esisha' and 'Ngenxa Yesivumelwano'. Chapter three deals with the characterization of radio trilogy. It distinguishes between the actors and characters. Different methods of character portrayal are investigated. Chapter four deals with perspectives on the theme of the radio trilogy. Types of themes are dealt with. Chapter five discusses the dialogue in radio trilogy. It deals with the differences between a dialogue, duologue and monologue, and explains the functions fulfilled by dramatic utterances and dialogue. Lastly a nature of dialogue as a characteristic of the dramatic action is discussed. Chapter six concentrates on the style of radio trilogy. Elements and different types of styles are discussed. Kinds of images, figurative language, proverbs, idioms, biblical allusions and various influences are discussed in detail. Chapter seven concludes by summarizing the main finding of this study, and giving observations about the quality of Ntuli's contribution to radio drama trilogy. It also explores some possibilities regarding future studies on Ntuli's radio trilogy. (Abednego Maphumulo)