Mon-Master grew tired of standing on the sidelines and transformed himself in the ultimate monster. Like Mantis he gained antennae and a green continence. Thankfully the robot brain's most endearing quality was its self-preservation otherwise Steel would've been molten slag.Then Sterling continued an odd pattern that separates him from his colorfully clad comrades...after defeating an adversary he steals the villain's device. First he claimed Magnetic Menace's vehicle, redubbing it the Sterling Scooter, and now the robot brain would accompany him back to his...fortress of soltitude? Or secret citadel (another homage Steel's writer Jerry Siegel made to his more famous creation, Kal-L). We'll revisit this.
Meanwhile Mon-Master returned when he was revived by Doctor Evil (this is before he was GROOVY BABY YEAH!) from the future, who had enlisted him as a henchman. Only it turns out that Steel and Black Hood have far more chemistry than this pair of larcenist loons. And the boys zooms off.