Alan Powers (or The Brain) is a third grade student in Mr. Ratburn's class at Lakewood Elementary School. He is voiced by Luke Reid, Steven Crowder, Alex Hood, Paul-Stuart Brown, Lyle O'Donohoe, Siam Yu, Max Friedman Cole, and Evan Blaylock.
Brain is an anthropomorphic bear who wears a grey sweater with olive green pants (according to the promotional art on the cartoon's official website, he had on khakis instead) and brown loafers. In the books, he wears different-coloured shirts and sweaters, and blue jeans or sometimes khakis. He has clumps of hair which are brown in the books, although the cartoon depicted the hair in thin black lines in order to simplify the animation process. He wears sneakers when playing sports. His pyjamas consist of a yellow sleep shirt and orange and yellow striped pyjama bottoms, and he is one of the few characters to wear detailed pyjamas in the animated series, while most other characters wore monochromatic pyjamas in order to simplify the animation process.
On formal occasions, Brain wears a charcoal or black tuxedo with two pockets on each side of the tuxedo jacket and a white tuxedo shirt with a black bow tie and matching trousers and black shoes. He also owns a grey single-breasted suit with two pockets on each side of the suit jacket. He wears a white collar shirt with a blue tie. He also wears matching grey trousers and light black shoes. He wears briefs.