<Tr> <Td_colspan="8"> When a Philadelphia serial killer resurfaces after an eighteen - years absence and releases a statement threatening to claim another life in five days, the BAU works with the now - retired FBI agent who spearheaded the original investigation to prevent him from making good on his threat . </Td> </Tr> <Tr> <Th> 16 </Th> <Td> 16 </Td> <Td> "The Tribe" </Td> <Td> Matt Earl Beesley </Td> <Td> Andrew Wilder </Td> <Td> March 8, 2006 (2006 - 03 - 08) </Td> <Td> 116 </Td> <Td> 15.27 </Td> </Tr> <Tr> <Td_colspan="8"> When five New Mexico college students are murdered and mutilated, the BAU determines the crime was commited by a pack obsessed with traditional Native American torture methods . Meanwhile, Hotch endures a tense reunion with his estranged brother Sean . </Td> </Tr> <Tr> <Th> 17 </Th> <Td> 17 </Td> <Td> "A Real Rain" </Td> <Td> Gloria Muzio </Td> <Td> Chris Mundy </Td> <Td> March 22, 2006 (2006 - 03 - 22) </Td> <Td> 117 </Td> <Td> 13.03 </Td> </Tr>

Criminal minds season 1 episode 18 guest stars