Theodore Jasper "T.J." Detweiler is the ringleader of his five best friends. He usually spends time planning pranks against the teachers at whitch he is quite talented. His siblings include an older sister named Becky who was seen in Recess: School's Out and T.J. has good leadership skills, and has a talent for speaking in public. He has been shown to have a crush on Spinelli in some in one episode. He was voiced by Ross Malinger from 1997 - 1998, and Andrew Lawrence from 1998-2001.

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