When Theodore discovers Alvin and Simon have a secret club, he promises not to tell anyone if they let him join.

Justin Long
Alvin Seville (Voice)

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Matthew Gray Gubler
Simon Seville (Voice)

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Jesse McCartney
Theodore Seville (Voice)

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Christina Applegate
Brittany Miller (Voice)

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Anna Faris
Jeanette Miller (Voice)

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Vanessa Bagdasarian
Eleanor Miller / Lucy/ Kate (Voice)

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Ross Bagdasarian, Jr.
Dave Seville (Voice)

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