The Doom Patrol #106

In "Blood Brothers [Part 1]," the Doom Patrol faces a deadly new threat as Nicholas Galtry, the cunning villain, orchestrates a scheme to eliminate them. With Mento's help, the team thwarts the initial assault, but when Steve Dayton—Mento’s secret identity—uncovers a deeper conspiracy, he sets out to expose Galtry’s true nature.

In "Part 2 Mento Meets the Atom Master," Mento teams up with the Doom Patrol to stop the rogue scientist M. 103, who has turned against them with deadly intent. When the threat is neutralized, Mento—revealed as Steve Dayton—takes it upon himself to expose M. Galtry as a thief, setting off a new chain of intrigue.