Bart then runs through time to the 21st century , and promises Patty he will return and rescue her .
Patty holds of Brainiac and breaks an energy projector , which returns Bart 's super-speed to him .
Bart then runs through time to the 21st century , and promises Patty Bart will return and rescue Patty .
Patty holds of Brainiac and breaks an energy projector , which returns Bart 's super-speed to him .