An impulsive scientist who cuts corners in her research work creates an uncontrollably mutating organism that speeds up the aging process.

While back in Minnesota to fill in as coach for a high-school hockey team, MacGyver tries to change the attitude of a callous player who has a shot at playing for the pros. But when this kid's ambition lands another player in the hospital, MacGyver must try and find out what or who is pushing him so hard to succeed.