From Wikipedia the free encyclopedia Andrew Robert Caldwell born July 25 1989 is an American actor He appeared on Hannah Montana as Thor a new kid from Minnesota that Jackson befriends He also plays the bully Bubba Bixby in the Nickelodeon movie Shredderman Rules which was based on Wendelin Van Draanens book series He also provided the voice of the teenage Avatar Roku in Avatar The Last Airbender Caldwell has made many appearances as small roles in several movies including Transformers where he was videotaping when the Autobots were landing on earth He had a role in the film Drillbit Taylor starring Owen Wilson and had a lead role in the 2008 comedy film College alongside Drake Bell Description above from the Wikipedia article Andrew Caldwell licensed under CCBYSA full list of contributors on Wikipedia