Bugs, Porky, and Beaky start their own messenger service. A mysterious stranger wants them to deliver a package to Omi-Akin-Bak at the Ritzmore Hotel. Bugs and Porky take the package to the hotel, only to find that Omi-Akin-Bak has checked out and returned to his home in Shangreet-Lo in the Forbidden Mountains of Tibet. Using Beaky's money, Bugs and Porky set out to deliver the package to Shangreet-Lo.; Bugs and Elmer are captured by deranged Prof. Lizer and his henchman Grubney after they see the professor use a strange machine to enlarge plants to giant-size. The Professor then uses a different machine to shrink Bugs and Elmer to ant-size.