Actor Coleman Dabney is an American actor best known for his roles in the television series Diff'rent Strokes and The Facts of Life. He is also known for his role as Gary Coleman in the movie On the Right Track. Dabney has appeared in numerous films and television shows throughout his career. He is also a voice actor, having provided the voice of the character of Gary Coleman in the animated series The Gary Coleman Show. Gary Coleman is an American actor who is best known for his role as Arnold Jackson in the television series Diff'rent Strokes. He is also known for his roles in the movies On the Right Track and The Kid from Left Field.