This season, Gough and Millar brought in Christopher Reeve, who portrayed Superman in four feature films, as a guest star for a pivotal role in Clark's life, that of Dr. Virgil Swann. The pair always had intentions of bringing Christopher Reeve onto the show, and when they found out that he enjoyed watching the show himself Gough and Millar decided that they were going to bring him on for season two. They had already crafted a character, Dr. Virgil Swann, they knew would reveal the truth about Krypton to Clark, and they decided that Reeve would be perfect for the part. Gough and Millar believed it was "natural" for Reeve to be the one to educate Clark about his past, and help him see his future, and the scenes between Reeve and Welling have been described as a "passing of the torch" moment for the series. Along with Reeve, another actor from the "Superman" films to be brought into the show was Terence Stamp, who portrayed General Zod in the first two "Superman" films. Stamp's role as Zod in the films, coupled with how the writing team portrayed Jor-El's early appearances—giving Clark a message that he will rule Earth with strength—led to fan theories that Jor-El was in fact General Zod at the ComicCon that met two months after the episode aired. Gough assured the ComicCon audience that the character was Jor-El, and not Zod in disguise.