The Worldbuster (recently called as Buster) is a giant dog from space that destroys all planets he finds in his way because it confused them with balls
Formerly, in Ballzeria system, Beeza and the Fleas built their perfect civilization. And eight different times, the Worldbuster came to destroy all they worked so hard to build. In fact, It happened so often that it became pure routine.
Unfortunately, the Worldbuster ended destroying the last planet of Ballzeria and Beeza and the Fleas only could fly through space until they run out of fuel or food, whichever comes first and fight off cannibals with some kind of pointy stick. So Wander and Sylvia had to help Beeza and the Fleas. In their first tried; the team builts a huge capsule which they launch into space and transform it into a giant mechanical bone which the Worlbuster follows after. Everyone celebrates their victory, but it does not last long as the Worldbuster returns and drops the giant bone onto the planet, being that, according to Sylvia, when someone trow a dog a bone, he fetchs it.
In their second tried; everyone is lined up in front of the Worldbuster. Wander has the Fleas take out a bunch of whistles and blow them to shoo the Worldbuster off. The whistle sounds are inaudible to them, but not to the Worldbuster who is annoyed. The plan does not work though, as after this, the Worldbuster begins barking back, causing everything to blow all over the place and begins licking everything with his tongue.
Their third and final tried consists in throw as much trash as the Fleas can at the Worldbuster's tongue, stopping him. But eventually resumes licking, being that, according to Sylvia, dogs love trash.
After having tried everything, the team flees to the rescue ship and off, allowing the Worldbuster to destroy the planet. Wander is upset but then comes up with another idea. He then breaks into the cockpit, take him out of there and take control of the ship in kamikaze plan to land between the Worldbuster's coat. Which turns out to be a great place for the Fleas to build their new civilization without any inconvenience.