When Martha finds Kal-El, Jonathan and her discussed possible names for their adopted baby. Martha suggested Christopher or Kirk, direct references to Christopher Reeve and Kirk Alyn.
According to James Tucker, breaking the three-part structure around Krypton, Smallville, and Metropolis was an attempt to mimic Richard Donner's Superman film.
When Martha finds Kal-El, Jonathan and her discussed possible names for their adopted baby. Martha suggested Christopher or Kirk, direct references to Christopher Reeve and Kirk Alyn.