Superman's Kryptonian physiology has been a matter of serious and humorous discussion, such as in Larry Niven's essay "Man of Steel, Woman of Kleenex". The novelization of the comics storyline "The Death of Superman", "The Death and Life of Superman" by Roger Stern, suggests that Superman's alien DNA has far too many and far too complex chromosomes. The 1998 crossover story "DC One Million", reveals Superman as the progenitor of a dynasty of part-Kryptonian protectors of the Earth, reference is made in the series of him marrying a fifth-dimensional queen in the 67th century and adding extra powers to his bloodline. Superman is portrayed as a father for the first time in canonical continuity, when he and his wife Lois become the foster parents of a Kryptonian boy, whom they named Chris Kent. This version of Superman and Lois Lane eventually has a biological son, Jonathan Samuel Kent in the "Convergence" series.