Ten-year old Ikki has one wish: to show off his Medabilities by representing his country in the World Robattle Tournament. Unfortunately, Ikki doesn't have a Medabot of his own, so all he can do is dream, until one day when he stumbles across a Rare Medal, the key to every Medabot's soul!

The World Robattle Tournament is finally underway. So far, Team Japan has managed to win its matches, but it hasn't been easy. And it hsn't helped that Space Medafighter X has been a different medafighter in every match. After narrowly defeating the Caribbean, French, and Mexican teams, Ikki and Koji now have to face the extremely popular and powerful Swedish team.

Ikki and Metabee are beginning to come to terms with each other. That's a good thing, because the Rubberobo Gang is stepping up their activities, and it's up to Ikki and his friends to stop them from taking over the world, or at least turning the neighborhood into a new wave housing development!

As the Rubberobo Gang under the direction of Dr. Meta-Evil step up their plans for World Domination, Ikki and his friends are learning more about the history and origin of the Medabots. Dr. Aki takes them on a tour of Medabot Corporation as part of their education. But things get rough when Seaslug infiltrates the company in search of Rare Medals.

The World Robattle Tournament is fast approaching and only the top three medafighters from each country advance to the Tournament. Guess who's on the list when the rankings are announced for Japan? Ikki and Metabee are ranked Third! If they can hold on to that ranking for a few days, they'll be representing Japan in the Tournament!

Ikki still needs a few more points to secure his place in the World Robattle Tournament, and he only has three hours left to gain them. But the Rubberobo Gang has kidnapped his mother in an effort to lure Ikki into a trap where they can steal Metabee's medal! Ikki and Metabee set aside their dreams of being in the Tournament and rush to the rescue!

Ikki and Metabee have defeated the Rubberobo Gang once and for all and have earned their place on the Japan World Robattle team. But when Erika sights a UFO, it turns out the aliens aboard are really the Rubberobo Gang. Have they been aliens all along?

The love bug is on the loose and it's biting Medabots and Medafighters alike. How can you help but fall head over heels for the charming piano teacher Miss Mimosa? Her admirers are coming out of the bushes, but who's the one special man she has her heart set on?