When Claire and Phil go out with a couple they met on vacation, the Dunphys end up having to pay the bill; Haley, Alex and Luke scramble to come through when Mitchell cashes in a birthday coupon they gave him.
A serial killer who jumps trains and targets people living near the railway is the subject of a BAU manhunt. Meta Golding ("Day Break") guest stars.
Michael seeks revenge against Whistler and Gretchen and uncovers unbelievable news; Lincoln and Michael are reunited with the gang and get an offer from a Homeland Security agent; Mahone experiences a devastating loss; T-Bag is deserted.
Jess’ dad arrives with his new girlfriend, who happened to be Jess and Cece’s high-school rival. Meanwhile, Schmidt recruits the guys to be part of a focus group at work to help him land a big new account.
Willis, Mario and Heather perform a radical operation on a maintenance worker stuck under a boiler that exploded; Angus' father tries to seize power of attorney over Mike, who remains in a coma.