Ken Lally

The BAU team investigates a string of brutal bludgeonings in Philadelphia and is led to the city's boxing scene in search of the killer. Also, Hotch makes a connection with an attractive runner as they both train for a triathlon.

Strange things are occurring on Enterprise, leading most of the ship's systems to become disabled. Before the crew can make repairs, a group of Osaarians board and loot the ship.

David finally decides to settle his debt to Victoria while Emily helps Nolan with a takedown of his own.

Archer rescues a mysterious slave girl from an alien market. However, she soon begins using her strange powers to collect information about humans for her Xindi overlords.

When four ruthless, powerful Villains -- "Knox" (guest star Jaime Hector), Flint (guest star Blake Shields), The German (guest star Ken Lally) and Jesse (guest star Francis Capra) -- bust into a bank and take hostages, Angela (Cristine Rose) sends H.R.G. (Jack Coleman) and his shocking, new empowered partner in after them. Determined to derail a cataclysmic future, Peter (Milo Ventimiglia) must first find what he lost along the way. Meanwhile, Hiro (Masi Oka) and Ando (James Kyson Lee) track Daphne (guest star Brea Grant) and part of "the formula" to Germany, but run afoul of The Haitian (guest star Jimmy Jean-Louis). Horrified by her ability, Tracy Strauss (Ali Larter) leaves Washington, D.C. to search for answers about Niki. A distraught Claire (Hayden Panettiere) asks Meredith (guest star Jessalyn Gilsig) to teach her how to fight. As his romance with Maya (Dania Ramirez) intensifies, Suresh (Sendhil Ramamurthy) finds himself unprepared when his experiment yields some unexpected results. Adrian Pasdar, Greg Grunberg and Zachary Quinto star. Randall Bentley, Ashley Crow, Noah Gray-Cabey, Ronald Guttman and Ntare Mwine guest star.