In the 1800s, a mysterious comet hits the U.S. southwest, transforming the local cattle and animals into their own version of the old west called Moo Mesa, complete with several lawmen dealing with bizarre outlaws.
J.R. takes Cody Calf and Buffalo Bull to the Invention Convention on the Dixie Trixie. Using his airship, Mules Verne and his henchmen steal the Dixie Trixie so that he can force all the inventors onboard to help him take over Moo Mesa by building a giant robot cowboy that will help in his plans by starting with raiding the governor's mansion.
