Alex Shostak Jr. worked 12-14 hours a day, When make-up was applied - to give the appearance that his eyes and mouth had been sewed up. A small straw was pushed between his lips to give him water. He couldn't open his eyes under the make-up, and he had to be guided by the crew members throughout the filming of his scenes.
Chris Owens guest starred in the fourth season as the younger version of the Cigarette Smoking Man in Musings of a Cigarette Smoking Man (1996) and in Demons (1997). He also played the Great Mutato in The Post-Modern Prometheus (1997).
This includes the first appearances of Cassandra and Jeffrey Spender.