▁some ▁trouble ▁in ▁the ▁city , ▁particularly ▁when ▁Dun no ▁uses ▁his ▁magic ▁wand ▁to ▁turn ▁a ▁Short y ▁into ▁a ▁don key , ▁and ▁then ▁turns ▁two ▁don keys ▁and ▁a ▁hin ny ▁into ▁Short ies . ▁ ▁Dun no ▁on ▁the ▁Moon ▁▁ ▁Do ono ▁disco vers ▁that ▁his ▁moon ▁rock ▁( that ▁he ▁obtained ▁from ▁his ▁previous ▁travel ▁to ▁the ▁Moon ) ▁creates ▁a ▁no ▁gravity ▁zone ▁when ▁interact ing ▁with ▁a ▁magnetic ▁field . ▁He ▁uses ▁this ▁knowledge ▁to ▁build ▁a ▁ro cket ▁ship ▁that ▁will ▁go ▁to ▁the ▁moon ▁much ▁more ▁easily ▁because ▁of ▁being ▁virt ually ▁weight less . ▁However , ▁Dun no ▁and ▁Rol y - Pol y ▁are ▁not ▁allowed ▁to ▁go ; ▁Dun no , ▁because ▁of ▁his ▁und is cipl ined ▁behavior , ▁and ▁Rol y - Pol y , ▁because ▁of ▁his ▁in ability ▁to ▁co pe ▁with ▁non - gravity ▁effects ▁and ▁excess ive ▁food ▁consumption . ▁The ▁night ▁before ▁the ▁ro cket ▁launch , ▁Dun no ▁and ▁Rol y - Pol y ▁s ne ak ▁into ▁the ▁ship ▁and ▁accident ally ▁launch ▁the ▁ro cket . ▁ ▁When ▁they ▁arrive ▁on ▁the ▁moon , ▁Dun no ▁and ▁Rol y - Pol y ▁become ▁separated ▁and ▁Dun no ▁falls ▁through ▁a ▁cave ▁and ▁disco vers ▁a ▁whole ▁separate ▁society ▁of ▁mit es ▁living ▁inside ▁the ▁moon . ▁ ▁However , ▁unlike ▁on ▁Earth , ▁these ▁mit es ▁do ▁not ▁have ▁" gi ant ▁food " ▁( that ▁is , ▁their ▁fruit