It is the day of the National Olympics, and Sweet Polly Purebred is there reporting the news to the people there and the TV watchers. The first event is the broad jumping contest. One of the contestants jumps, but keeps soaring high and high into the air. Everyone is amazed, but the same thing happens with weightlifter and the pole vault jumper. As a result of these strange incidents, the Olympics are cancelled and scientists get to work getting to the bottom of the incidents. Professor Bruno Heimerdown comes to the conclusion that the phenomenon might have to do with the new planet they recently discovered. General Ricketts has a meeting at the White House that they have to go to the planet and see what's on it, as it might wipe out Earth, and only Underdog is the strongest person to do so.
