Arthur decides to sell his old toys but is reluctant to part with his old bear.

Arthur views his little sister in a different light after receiving a revealing letter from his pen pal.

Although Arthur loses the Super Chimp Club contest, his pupil, sister Violet, wins the first grade reading competition and a prize for them both.

Arthur the chimp is a little worried about losing his loose tooth, until his sister and their babysitter show him the real meaning of bravery.

While hurrying to get on the school bus, Arthur and his friend unknowingly switch their lunchboxes. Later Arthur finds out what surprise his sister had put into hers.

Arthur the chimpanzee, after worrying that his Halloween costume won't be scary enough, wins a prize for the most original costume in the school.