When a space shuttle mission is sabotaged, Mulder suspects it may be the work of an evil extraterrestrial spirit that inhabits the body of a former Gemini astronaut.
Savannah is furious with Marti for keeping a secret about Dan from her so she goes home for a couple days to cool off and reconnect with her family. Meanwhile, Marti is conflicted over her feelings for Dan and Lewis, and focuses on Travis’ case to keep her mind occupied. Vanessa finds out Bill Marsh took away the Hellcats’ gym and turns to Red for help.
While investigating a string of jewelry thefts, a long time friend of MacGyver's is murdered.
In Chicago, MacGyver tries to help Roxy, an old friend, during her shoot of a Rock Against Drugs video. She believes her twin sister is trying to kill her, fueled by jealousy over her music career.
When an Olympic-bound gymnast dies of complications linked to a steroid overdose, Officers Penhall and Hoffs go undercover on the athletically competitive Augustana High School campus to discover the source.
