In this series, the main character, Mikey Kudo, and his friends are transported to the Digital World and become bonded with Digimon partners. However, instead of being directly transformed, they become "fused" with their Digimon, resulting in a human-Digimon hybrid form called "Fusion Fighters". This allows them to utilize the Digimon's abilities and fight alongside them.
The series explores the themes of friendship, teamwork, and overcoming challenges while navigating the dangers of the Digital World.