Dennis is the goldfish of Stanley Griff, and the deuteragonist of the 2001 Playhouse Disney (now Disney Junior) TV series Stanley. In fact, he is Stanley's best friend who gives him education about animals to help him with his everyday problems, which interest him. He also has to point out the flaws in Stanley's ridiculous solutions. He even breaks the fourth wall by either encouraging the audience to do something fun or by asking them questions at the end of almost every episode. He has musical talent and is sometimes shown to be playing the music for songs featured within installments of Stanley.