Darkwing is in the process of trying to transfer data from his mainframe computer to the on-board computer on the Thunderquack. Gosalyn and Honker come in playing hockey. Darkwing's computer doesn't work so he starts hitting the button. It breaks and starts sparking. Just then a lightning bolt strikes the computer and it zaps everyone. Darkwing and Gosalyn switch bodies and so do Launchpad and Honker. Just then a message from SHUSH shows up and Darkwing must so find a missing rocket. Meanwhile, Gosalyn and Honker decide to go for a drive since they are now in grown-up bodies. Mayhem ensues and Gosalyn winds up crashing the car into the living room.
Darkwing is having problems getting into the army base since he is in Gosalyn's body. He and Launchpad get thrown out and they drive down the road on the motorcycle and get pulled over by a traffic cop. The cop brings them home and Gosalyn enjoys punishing Darkwing. Darkwing walks in and finds the car in the living room and starts to fuss at Gosalyn when a SHUSH message appears. They contact J. Gander Hooter and find out that Steelbeak is using the missing rocket to stop the earth's rotation and is demanding a ransom to return things to normal. J. Gander tells Darkwing where the rocket is and they head off to stop Steelbeak.
They get to the rocket and knockout two egg men to get in. Darkwing tells Gosalyn and Honker to stay behind while he and Launchpad sneak into the rocket. Darkwing and Launchpad get captured by Steelbeak and are stuffed into an astronaut's suit. Steelbeak gets a couple of egg men to haul them off and it turns out that the two egg men are Gosalyn and Honker in disguise. They are spotted and chased by more egg men. Gosalyn and Honker are blown outside the rocket and tied up in the path of a rocket booster by Steelbeak. Darkwing and Launchpad are able to get out and rescue them. They get back inside and Darkwing confronts Steelbeak. In the process of dodging Steelbeak and maneuvering the rocket, Steelbeak smashes the control panel and causes an electrical shock to hit Darkwing, Launchpad, Gosalyn, and Honker. Launchpad and Honker switch back first. Then Darkwing and Gosalyn switch leaving Gosalyn alone to fight Steelbeak. She dodges him and starts the main rocket engines. She gets out and they all run out of the rocket just before it takes off into space with Steelbeak.