Actually, "A Contamination Problem" is a heroside arc. And one of the nice things about Architect Entertainment is it'll work regardless of level -- the "Ripping Out Reform" arc has been successfully played enjoyably (so I am told) by L5 villains.

Further? Heroes and Villains can both play any arc. It is, after all, entertainment. So if your bold hero feels like... well, roleplaying as a villain for an afternoon....