Plot summary
Jess and Robby go hiking. Aly is back in town, so Winston throws a party with Schmidt and Cece hosting at their mostly completed house. Winston invites Aly's entire family, only to find out she has a large number of relatives and that she is not happy about seeing all of them. After a series of unfortunate circumstances, Jess and Robby end up in a cave and discover the shocking truth about why they are so similar in personality and preferences.
Credits
Adapted from Wikipedia contributors, New Girl season 6. HTML formatting and reference markers removed.