Simon Seville is the chipmunk in blue clothing and the middle brother and the tallest of the Chipmunks.

In addition to having an IQ just north of Albert Einstein, Simon possesses a very dry sense of humor as well as a keen wit. His chess master mind allows him to anticipate Alvin's hairbrained schemes (Simon's phrase, not Alvin's) and devise a solution that is inevitably required. In the end Simon loves Alvin, although he secretly worries that they share the same gene pool.

He is voiced by Ross Bagdasarian, Jr. in the TV series and Matthew Gray Gubler in the 2007 film.

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