Marshall enlists Ted and Barney to help him figure out where Lily went when she left in the middle of their fight. (TV-14 D, L)
On the morning of the wedding, Lily and Robin have a fight and Barney freaks out about which suit to wear. Meanwhile, the gang watches a movie Ted has forbidden them to see. Lucy Hale, Chris Kattan, and Jon Heder guest star. (TV-14 D, L)
When Barney suffers from the world's worst hangover the morning of his wedding, the gang tries to figure out the far-fetched ingredients to concoct the Stinson Hangover Fixer Elixir. (TV-14 D, L)
When Robin and Loretta's conflict escalates, Barney is caught in the middle. Meanwhile, Marshall and Daphne deal with a stowaway on their road trip, and Ted and Cassie try to enjoy a trip to a lighthouse. (TV-14 D, L)
Season 4, Episode 22 (Right Place Right Time): Ted explains to his future kids how a series of unrelated events led to a chance encounter with a former girlfriend. Barney makes the 200th notch in his bedpost.
Season 4, Episode 21 (The Three Days Rule): When Ted violates the "three days rule" by continually texting with a girl he's just met, Barney and Marshall retaliate by impersonating her.
Season 4, Episode 20 (Mosbius Designs): Ted goes out on his own as an architect and hires an intern, but all he helps himself to is Robin. News of layoffs at GNB has Marshall looking for a schtick to make himself indispensable.
Season 4, Episode 19 (Murtaugh): Barney tries to complete, in one day, all the tasks from a list Ted made to prove the gang's not too old to do. Meanwhile, he challenges Ted to complete a list of things they're too young to do.
Season 4, Episode 18 (Old King Clancy): Marshall and Barney lie to keep Ted from finding out the headquarters he'd been hired to design has been canceled.
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