TV Series. Comedy TV Series (1997-1999). 3 Seasons. 51 episodes. Smart Guy was an American sitcom, about the misadventures of a ten-year-old kid named T.J. Henderson (Tahj Mowry) and well known for his extraordinary intelligence. After being promoted from 4th grade to 10th Grade, T.J. deals with the usual problems of fitting in as a genius, while being a little kid in a big world of high school. Together with his dimwitted yet lovable best friend Mo ...