In California's Center City, the shy yet kindhearted Joseph Carter "Joey" Jones resides with his grandmother while working at a coffee shop. Despite his family's financial struggles and the bullying he endures at school, he maintains a cheerful demeanor. An avid robotics fan, Joey desires nothing more than a high-end toy robot known as a Heybo. One day, Joey and his friend Simon "Psy" Kaina discover a wrecked Heybo that was discarded by a group of wealthy children. He brings it home and repairs it himself, enthusiastically naming it Heroman. However, one night Heroman is hit by lightning and comes to life, growing several times its original size in the process. That same night, Center City is attacked by aliens called Skrugg, whose attention was drawn to Earth after Joey's acquaintance, Professor Matthew Denton, attempted to contact them. Alongside Joey, Heroman quickly rushes to the scene of the attack, where he finds people in distress, including his friend Lina Davis and her father. Using an arm-mounted controller, Joey commands Heroman to use superpowers to fight off the Skrugg and rescue civilians. As the aliens continue their invasion of Earth, the duo are the only ones standing between humanity and destruction.