Willie and Barney inadvertently blast off in the rocket, making Buck, Wilma, and the doc think that it has been stolen. With good reason, as they discuss a recent break in into their lab.
Meanwhile, Barney and Willie realize that big explosion, and rumbling meant that they had taken off. Wow, how could you mistake an event like that. Since they are cruising through the skies, they decide they will do the test flight for Buck and Wilma.
Barney has trouble remembering the device name that the doc invented. Doc, Buck, and Wilma are surprised, but relieved to hear that Barney is at the helm of the space ship, and things are fine so far.
When Barney gets news that Kane and Ardella, two dangerous criminals are on the loose, they turn around and head straight back. At least until they discover a stowaway.