Season 5, Episode 1: Definitions

Original Air Date: 21 September 2009

Pilot: As Ted begins his new career as a professor and is about to meet his future wife, Lily forces Barney and Robin to have "the talk" and define their new relationship.

Season 5, Episode 2: Double Date

Original Air Date: 28 September 2009

Plot: Ted goes on a blind date with the same woman he went on a blind date with seven years ago, and Barney and Marshall find Lily's stripper look-alike.

Season 5, Episode 3: Robin 101

Original Air Date: 5 October 2009

Plot: When Robin fears that Barney is cheating on her, she soon discovers that he is spending his evenings with Ted learning everything there is to know on how to date her

Season 5, Episode 4: The Sexless Innkeeper

Original Air Date: 12 October 2009

Plot: 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. Meanwhile, Ted gets a new nickname from Barney after an unsuccessful hook-up.

Season 5, Episode 5: Duel Citizenship

Original Air Date: 19 October 2009

Pilot: While Barney tries to convince Robin to become an American citizen, Ted and Marshall's fabled road trip takes a wrong turn when Marshall invites Lily.

Season 5, Episode 6: Bagpipes

Original Air Date: 2 November 2009

Pilot: Despite their best efforts to be the perfect couple, Barney's know-it-all attitude gets him in trouble with Robin and they are forced to ask Marshall and Lily for relationship advice.

Season 5, Episode 7: The Rough Patch

Original Air Date: 9 November 2009

Plot: After Barney and Robin hit a rough patch in their relationship, Lily devises the perfect plan to break them up, calling in help from Robin's famous friend, Alan Thicke.