Kobe Bryant and Tim Duncan are widely regarded as two of the greatest basketball players in NBA history. Both led their teams to championships, and both were named MVP and All-Star multiple times. But Bryant, the "Black Mamba," and Duncan, the "Big Fundamental," had very different styles of play and ways of interacting with their teammates, coaches, and fans. This case offers an overview of these two champions' careers and allows a lively conversation about star performers, leadership, key leader behaviors, how those behaviors relate to effectiveness, and the role of charisma in the leadership process. Importantly, students do not need to know anything at all about basketball to be on equal footing with those who are basketball fans, because the case exhibits provide evidence for quantitative comparisons, and the case text describes qualitative information that facilitates discussion.