Arnold Jackson is a fictional character on the series Diff'rent Strokes, and he was portrayed by child star Gary Coleman. Arnold Jackson is the younger brother of Willis Jackson (Todd Bridges) and was born in Harlem, New York City in 1971. Arnold is a precocious moppet, who was pratically known for his catchphrase "Whatchoo talkin' bout?" which became popular in pop culture. Arnold's father died in 1975 and his mother died in 1978. His mother worked as a housekeeper for a wealthy Caucasian widow, Philip Drummond (Conrad Bain). Before her death, his mother expressed her wish for the children to be cared for by Mr Dummond. He agreed, and in 1979, he officially adopted Willis and Arnold. Arnold is the main, and the near breakout character in the television series. In many episodes he is shown as being a selfish younger brother. When the boys first moved in with Mr Drummond, Willis wanted to move back to Harlem. Arnold objected, but eventually Willis changed his mind and they decided to stay with Drummond. In another episode, Arnold has to fight a school bully named "The Gooch" so that he will not pick on him any more, but Drummond does not want Arnold fighting the bully and decides that Arnold make peace with "The Gooch". Arnold however listens to his brother, Willis, who told him to fight back. This ended with Arnold having a black eye, and both boys were in trouble. Gary Coleman became popular for his role as this character, who guest starred on the final episode, with Mr. Drummond, of The Fresh Prince of Bel-Air, when they decide to buy the family's house.