 Luthor realizes that this ploy will cause war because the suspicious US and   Russian sides will each think that the other side is trying to pull a fast   one and everyone is going to die, leaving Nuclear Man to rule with Lacy.   They hurry off but right as Luthor and Lenny go to their underground cavern,   Superman shows up and confronts them but there is no time to deal with   Luthor, so he and Lacy fly off. 