|The name or term "Micronauts" refers to more than one character or idea. For a list of other meanings, see Micronauts (disambiguation).|
The Micronauts are a ragtag team of heroes from Microspace. Originally a small-time crew of smugglers aboard their ship, the Heliopolis, they found themselves drawn into the conflict between Baron Daegon's Ministry of Science and Baron Karza's Ministry of Defense. They are now stuck on a strange, mysterious world populated by giant creatures and even bigger machines.
The team that would become known as the Micronauts were a group of smugglers consisting of Space Glider Phenolo-Phi, a first-gen Acroyear, a Microtron unit, and Pharoid Oziron Rael. They were hired by Hezlee Ferro to steal a pack of medical supplies from a Ministry of Science Valtricos station. Ferro assigned his security agent Larissa to accompany them on the job. When the Micronauts arrived at the station, they found it protected by numerous sentry-bots that attacked them upon arrival. After unsuccessfully trying to fight off the sentries, the crew fled to a room storing a Biotron unit. Oz got in the Biotron, which reveals that there weren't any medical supplies on the station; the station was actually developing a biological weapon. A group of Phobos units then attacked, blowing a hole in the station and causing the Micronauts to go flying.
After flying into the entropy storm, the Micronauts were attacked by Reptos, a race of beings previously thought destroyed by the cloud. Before the Reptos could destroy the Heliopolis, the crew was saved by the mysterious Time Traveller.
Several days into their journey, Microtron scanned the surrounding area looking for something to fuel the Heliopolis, detecting something "big". The Micronauts then received a message from Baron Karza. Karma told them that though it had only been a few days for them, years had passed for Karza. Microtron then informed Oz that he discovered the source of the energy he detected, as well as the source of Karza's signal. Oz struggled to comprehend and Karza explained that "it" was the birthplace of Microspace: the body of Micronus Prime.
Karza revealed that Micronus had a spacebridge, allowing them to travel to another universe and retrieve Ore-13, which Karza claimed could bring order to the entropy cloud. Karza enlisted the Micronauts to travel to the other planet to save Microspace. The Micronauts were hesitant to trust Karza but as they debated, a Time Traveler appeared, urging them to enter the now-open bridge. The Micronauts arrived in Autobot City, only to discover what appeared to be a giant Karza robot standing in their way.