Professor Pepperwinkle creates a robot whom he calls Mr. McTavish. It isn't long before Jimmy and Lois learn about him and Professor Pepperwinkle shows him to them. Later Superman shows up but as he is approaching McTavish he starts to feel weak so he leaves. That's when they learn that Professor Pepperwinkle placed a meteorite in McTavish which they deduce is krypton...