The Exploding Meatball Sub
Lily and Barney react badly when Marshall finally quits his job at Goliath National Bank to take a volunteer position at an environmental organization. Meanwhile, Ted and Zoey's opposing positions on the future of the Arcadia come between them.
Trilogy Time
Ted, Marshall and Barney embark on another "trilogy time", where they get together every three years to watch the "Star Wars" trilogy and envision what their lives will be like in another three years. Meanwhile Barney and Quinn move in together.
The Time Travelers
Ted and Barney's future versions attempt to persuade present day Ted to go see Robots Versus Wrestlers. Marshall and Robin have a dance-off.
The Debate
Leslie goes toe-to-toe with Bobby Newport in a debate. Ann, Tom, and Chris work in the media spin room, while Ron goes the extra mile to save a party for Leslie's donors.
Summer Catalog
Preparing the Summer Events Catalog, Leslie decides to take Ron and the past directors of the Parks Department out for a picnic lunch. Tom enlists the help of Ann and Mark to pose for the cover photo.
Flip Flop
Phil gets desperate when Cam and Claire’s flipped house is more difficult to sell than expected; Javier brings his new girlfriend along to visit Manny.
The Last Walt
A visit from Cameron's father features an awkward dinner for Jay and Gloria at Mitchell and Cameron's house. Meanwhile, Claire helps Luke face the death of an older neighbor, Phil and Alex have a father-daughter bonding experience, and Haley throws a party without permission.
Someone to Watch Over Lily
Mitchell and Cameron assess their family members in trying to decide who would best take care of Lily should anything happen to them.
Benched
When Luke and Manny's hot-tempered basketball coach quits in the middle of a game, Jay and Phil both jockey to fill the position. Claire and Gloria each struggle with the realization that they might not be number one in their children's lives anymore, and Mitchell takes Cameron along to meet a prospective employer, but Cameron's big personality doesn't necessarily help to make a good impression.
The Herb Garden Germination
Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.