Brain's Shocking Secret

Summary
Brain doesn't want anyone to know why he was in two kindergarten classes. He tells everybody that geniuses fail grades because they get bored in classes, leaving Binky convinced that he is a genius himself.

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Trivia

 * Muffy is seen in the gang's kindergarten picture. However, the episode Arthur and the True Francine reveals that she's known the gang since second grade.
 * Up until this episode, only Prunella knew about Brain's secret the whole time.

Home Videos
DVDs:
 * Arthur: Season 11
 * Big Brother Binky (DVD)
 * Germophobia (DVD)