Escaping from Prince Shaitan and Baron Karza, the Micronauts arrive on Earth where they are the size of small toys. Prince Shaitan succeeds in following them and attacks them in the garden of the Coffin Family.
Escaping from Baron Karza and his dog soldiers, The Micronauts pass through the space wall in their spacecraft, the Endeavor. Suddenly, the vessel emerges into normal gravity and crashs into a amazing landscape with huge vegetation. Without serious damage to either themselves or their ship, The Micronauts decide to explore the strange planet. They find a big metal construction which is identified as a swing before they are "attacked" by a ... giant Cocker Spaniel. They are on Earth but their relative size hasn't changed, and they are only a few inches tall !!!
In the garden, a little boy (but a giant to the heroes) uses a lawnmower which Acroyear destroys in order to protect his teammates. Realizing that The Micronauts are actual people, the adventurers and the boy discuss what has happened. Marionette relates their story to the giant youth, named Steve Coffin.
After a few minutes, Prince Shaitan, sent by Baron Karza, arrives on Earth with a small fleet of Acroyear battle cruisers. The battle between the Acroyear's fighters and the Micronauts (helped by Steve), destroy Steve's garden. The heroes succeed in defeating Shaitan's attack force, but Shaitan escapes, and now Steve has to explain all the damage to his father.