When Lily and Marshall realize that Robin and Barney are the perfect double-date friends, they try too hard to impress and come on too strong, forcing Barney and Robin to try to break up with them
Ted realizes his blind date is the same girl he had a blind date with seven years prior. Meanwhile, the rest of the gang discover a Lily look-alike at a strip club.
When Marshall and the gang finds out that Barney and Robin are hesitant to define their relationship, Lily forces them to confront their biggest fear. Meanwhile, Ted is anxious about teaching his first lecture at Columbia.