Commander Rann returns to Homeworld from his 1,000 year exploratory voyage across the Microverse in his ship, the Endeavor. The evil Baron Karza has overthrown the ruling royal family with the support of the people. Rann escapes with Marionette, Bug, Acroyear, and Microtron.
After travelling through the Spacewall, the Micronauts land in a backyard in Florida, where they are only 6 inches tall. The encounter Steve Coffin, a teenage human and fight Battle Cruisers commanded by Shaitan.