Plot
A ship from Krypton brings to the Kent farm a rod giving off a faint signal much like readings Prof. Hamilton has been getting from within the Phantom Zone. The professor and John Henry Irons strap Superman into a device to translate the signals from the isobar directly into Superman's mind. In this way, Superman learns the "true" story of Krypton's last days from his father Jor-El. Superman makes plan to follow the signal back through the Phantom Zone to Jor-El's Krypton, and Lois insists on going with him.