The Indian caves introduced in the previous episode "
Skinwalker" happen to harbor an alien parasite which feeds on the adrenal glands of teenagers. Among those infected by the parasite is Clark Kent's (
Tom Welling) best friend, Pete (Sam Jones III). His mind and personality altered by the "invader" in his system, the usually shy and mild-mannered Pete becomes a reckless, extroverted daredevil -- thus endangering not only his own life but those of everyone around him. ~ Hal Erickson, All Movie Guide