Henry is kid on vacation with Professor Tengai along with his fellow class mates.
After Ashley finds the chamber where the Dark Bit-Beasts are sealed, he accidentally breaks Dark Dragoon's seal and gets possessed by him.
He later attacks Daichi along with the other Shadow Bladers to get the power of the Golden Dragoon. When Tyson comes to rescue Daichi, Daniel along with the others battle him and seal his bit-beast.
He is next seen when he joins Ashley in battle with Kai. The four shadow bladers are about to seal Dranzer when they are interrupted by Tyson, Ray and Max. Revealing their true forms, Dark Dragoon speaking through Henry narrates the events that took place, which caused the Dark Bit-Beasts to be sealed on the deserted Island. He tells Tyson and Co. about the unfair treatment of the dark beasts by their light counterparts, who sealed them to avoid conflict with the humans and reveals their intentions of sealing the holy beasts and getting revenge on humanity.
In the battle that follows, he and Henry are the only ones who survive the first collision of special moves. They then continue fighting Tyson with the recovered Daichi as they battle with Strata Dragoon siding with the Bladebreakers.
After his & Daniel's losses, he returns to normal and had no memories of the event that happen.