History: (Green Lantern / Sinestro Corps: Secret Files #1) - Maash was originally conceived as triplets, but their bodies fused and they were born as one child with three heads. Each head had its own personality, and two of them grew up to be sadistic killers. The third head was the innocent man, who could only watch on in horror as his body committed unspeakable acts against others, and prayed that he would one day have control over his own body. Maash was chosen to join the Sinestro Corps because of his ability to instill great fear.

(Green Lantern: Sinestro Corps Special #1) - Sinestro gathered Maash and the Sinestro Corps on Qward. Sinestro laid out their mission of using fear to make the chaos of the universe bend to their will, and to replace it with law and order. Their first step was to burn anyone that would oppose their plan, so they had to destroy the Green Lantern Corps. They brought Kyle Rayner to Qward and stripped him of the Ion entity. Sinestro made Kyle feel fear, and infected him with the Parallax entity, which he then presented to his guardian, the Anti-Monitor.

(Green Lantern IV #25) - Maash and the Sinestro Corps continued to wage war on Earth while Hal and Kyle went to Coast City to protect it from Sinestro, and Hal issued a radio broadcast asking the residents to flee. Not a soul left, everyone had faith Hal would save them from Sinestro. Sinestro and a number of his soldiers engaged Hal and Kyle, and Sinestro told them he’d already won the war. His actions made the Guardians rewrite the Book of Oa, and now that the GLC could use lethal force they would be feared. Sinestro always wanted the GLC to be a more totalitarian police force to bring order to the universe, and he’d succeeded. Sinestro and Hal’s rings were both drained of power, and they squared off in hand-to-hand combat. Hal won, and told Sinestro he was under arrest. In NYC the Anti-Monitor tapped into Earth’s energy and prepared to unleash an anti-matter wave to consume Earth. The GLC ruptured the heart of Anti-Monitor’s Warworld, the Sinestro Corps central power battery, and created a shield around Warworld and the Monitor. The ensuing blast nearly destroyed the Anti-Monitor, and he was finished off by Superman-Prime, who betrayed him for having destroyed his home, Earth-Prime. With the Anti-Monitor destroyed, Sinestro vanquished, and having no way of recharging their rings the Sinestro Corps fled Earth to lick their wounds.

Maash received a profile in Green Lantern / Sinestro Corps: Secret Files #1.