Justin Long .
Ross Bagdasarian, Jr. was the creator and first to voice Alvin and the Chipmunks.
Justin Long .
Jesse McCartney provides the voice for Theodore in "Alvin and the Chipmunks: The Squeakquel" .
Jessie mcartney is one of them.
Amy Poehler .
Christina Applegate .
The voice of Eleanor is by Amy Poehler.
Yes, in the 2007 version of Alvin and the Chipmunks and 2009 Alvin and the Chipmunks: The Squeakuel, Jesse McCartney is the voice of Theodore. Obviously, McCartney is not the original voice of Theodore since he only voices him in these two movies.
Matthew Gray Gubler provides the voice of Simon Seville in "Alvin and the Chipmunks: The Squeakquel" .
Jesse McCartney plays the voice of Theodore.
In the 60s show titled "The Alvin Show," the Chipmunks were all voiced by the same acttor; Ross Bagdasarian. In the 1983 series which was titled "Alvin and the Chipmunks," Ross Bagdasarian returned to perform the voices of Alvin and Simon however Janice Karman did the voice of Theodore. In the Chipmunks movies Justin Long did the voice of Alvin, Matthew Gray Gubler did Simon's voice and Theodore was voiced by Jesse McCartney.
Matthew Gray Gubler