The park staff get Rigby's brother in for an audit. Don loves hugging people, but Rigby refuses to so much as embrace him.
!!This episode provides examples of...
* TheAce: Don much to Rigby's chagrin.
* NakedOnArrival: Although strictly speaking Mordecai, Rigby and Benson have been naked all along, it's more noticeable in Don's case because he has a muscular humanoid body.