Mason is a villain in Choudenshi Bioman. He is the leader who once plotted against Doctor Man himself. Armed with a staff which fires bolts. In Episode 10, he weilds a laser gun with anti-bio particles and was responsible for the death of Mika Koizumi, the first Yellow Four, who continuously sacrificed herself to take the all the lasers to ensure it was out of ammo and the rest of the team won't suffer the same fate. Mason was later rebuilt and armed with Meison Rockets and Meison Machinegun. He was killed by Silver.