Adam Monroe, also known as Takezo Kensei (剣聖 武蔵 Kensei Takezō?) in feudal Japan, is a fictional character portrayed by David Anders in the NBC science fiction drama Heroes. The character first appears in the second season episode "Four Months Later...", although the legend of Kensei is referenced several times during the first season. His regenerative ability has halted his aging, making him centuries old in the present of the series. He is the primary antagonist during the second season.