Everybody makes mistakes-even someone with the superpower of supreme super-intelligence. Source: Mondadori Portfolio / Getty That's a message made clear as The Boys enters its final stretch and Susan Heyward unpacks the mindset behind one of its most compelling additions. Sister Sage is a character defined not only by her unmatched intelligence, but by the high-stakes consequences of a single miscalculation. And for Susan, the idea of playing the smartest person in the world was enough to spark conversation long before the supe ever appeared onscreen.