When Claire and Phil go out with a couple they met on vacation, the Dunphys end up having to pay the bill. Elsewhere, Haley, Alex and Luke scramble to come through when Mitchell cashes in a birthday coupon they gave him.
The unit begin a manhunt for a serial killer who jumps trains, targeting individuals living close to the railway.
Zoe enters a gumbo competition and has to treat a patient bitten by a snake.
Jess' dad arrives with his new girlfriend, Ashley, who happens to be Jess and Cece's high school rival.
Terrorist leaders are suspected of murdering a retired army sergeant; Deek connects with a person of interest in the case.