The investigation of a series of bludgeonings in Philadelphia leads the team to the city's boxing scene; Hotch connects with a fellow runner while training for the triathlon.
The Enterprise is crippled by waves of destructive anomalies that distort the laws of physics while searching for the Xindi; Ventaxian pirates attack the ship.
A slave girl, Rajiin, uses her mental powers on the crew to steal information on humans for her Xindi overlords; Trip and T'Pol attempt to insulate the ship from further destruction from a physical phenomenon.
When four powerful villains take hostages at a bank, Angela sends H.R.G. and his shocking new partner in after them; Claire asks Meredith to show her how to fight; Suresh finds himself unprepared when an experiment yields unexpected results.
Kendall orders Sydney to recruit Dixon.