Brian Groh

Gideon, Hotchner and their team race across the South in pursuit of a chameleonlike killer.

A murderous psychopath taunts the team by leaving clues to the next victim's identity during the week of Halloween.

When Harm, Mac and Bud investigate a Medal of Honor candidate, they find a man very different from his public persona.

Martin searches for Teller's workshop and ends up helping another professor win at poker; a man creates a viral video to track someone down; a man learns a lesson from a horse while visiting his late father's ranch.

When the Cyber team investigates what appears to be a hack into air traffic control's communication system, a greater threat emerges when a flight vanishes into thin air.

When Ray discusses Nathan's history of being a terrible wingman, Nathan tries to become less self-involved so he can be a better friend.