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Season 5 of How I Met Your Mother aired from September 21, 2009 to May 24, 2010 and contained 24 episodes from Definitions to Doppelgangers.

SynopsisEdit

Ted starts his first day as an architecture professor, standing in the middle of a classroom in which the mother was present, but it turns out not to be the architecture class he is supposed to teach. Barney and Robin have had a sexual relationship throughout the summer, but are not ready to label their relationship. However, Lily locks them in a room, forcing them to come to terms with their relationship. They date for a few weeks, but after a rough patch, they decide to break up. Robin describes it instead as "two friends getting back together." Barney immediately goes back to his old ways, using the playbook to score with women. Marshall uses his fourth slap on Barney. Ted dates a graduate student named Cindy (Rachel Bilson) and it is revealed that her roommate is his future wife.

Robin gets a new co-anchor on her show Come On, Get Up New York!, named Don. Although Robin initially dislikes him due to his unprofessional manner, the two start dating, and Robin later moves in with him. Robin later get a call from WNKW in Chicago, offering her the anchor job. Robin turns it down, keeping her relationship with Don ahead of her career, but is devastated when Don tells her that he took the same job.

Lily and Marshall are unsure about having a baby, and they decide they they will start trying when the spot the fifth (Barney's) doppelganger. They finally spot Barney's doppelganger, as a brunette cab driver, and decide to start trying to have a baby, but it turns out that the cab driver was actually Barney, and he had worn the disguise to try to pick up women. When Marshall finds this out, he decides not to tell Lily, fearing she will want to wait even longer to have children. Lily eventually finds out and decides to wait. A few months later, Lily thinks has spotted Barney's doppelganger as a hot dog vendor, which causes the group to realize she is seeing what she wants to see, and play along. They then tells Marshall that she is ready to have a baby.

CastEdit

Main Cast

In order of character appearances

Josh Radnor as Ted Mosby (24/24)
Jason Segel as Marshall Eriksen (24/24)
Alyson Hannigan as Lily Aldrin (24/24)
Neil Patrick Harris as Barney Stinson (24/24)
Cobie Smulders as Robin Scherbatsky (24/24)
Bob Saget as Future Ted (24/24) (Uncredited, voice only)

Recurring Cast

In order of character appearances

David Henrie as Future Son (9/24)
Lyndsy Fonseca as Future Daughter (9/24)
Benjamin Koldyke as Don Frank (6/24)
Marshall Manesh as Ranjit (2/24)
Joe Nieves as Carl (2/24)
Charlene Amoia as Wendy the Waitress (2/24)
Cristine Rose as Virginia Mosby (1/24)
Joe Manganiello as Brad (1/24)
Bryan Callen as Bilson (1/24)
Rachel Bilson as Cindy (1/24)

Episode List: 2009 - 2010Edit

Title	Writer(s)	Director(s)	Airdate	#
Definitions	Carter Bays Craig Thomas	Pamela Fryman	September 21, 2009	5x01
The gang uncover Barney and Robin's recent romance and Lily forces them to "define the relationship". Ted must decide what kind of professor he is going to be.
Double Date	Matt Kuhn	Pamela Fryman	September 28, 2009	5x02
Ted has a blind date, and discovers its the same date he was on seven years ago. They retrace their steps from their first date to see where they went wrong. Meanwhile, Marshall and Barney go to a strip club and find a stripper who looks exactly like Lily.
Robin 101	Carter Bays Craig Thomas	Pamela Fryman	October 5, 2009	5x03
Robin thinks Barney is cheating on her, but instead he's been taking "Robin 101" classes from Ted. Meanwhile, Marshall tries to give away his barrel, but is upset that no one seems to want it.
The Sexless Innkeeper	Kourtney Kang	Pamela Fryman	October 12, 2009	5x04
Barney tells Ted he's been used after a girl stays over but doesn't have sex with Ted. Barney and Robin suffer through an awkward "couple's night" with Marshall and Lily.
Duel Citizenship	Chuck Tatham	Pamela Fryman	October 19, 2009	5x05
Robin faces deportation so Barney decides to help her become an American citizen. Ted and Marshall go a road trip to relive their college days but Marshall invites Lily along.
Bagpipes	Robia Rashid	Pamela Fryman	November 2, 2009	5x06
Lily and Marshall have relationship problems, while Ted tries to determine if Barney and Robin's relationship is really going as well as it appears.
The Rough Patch	Chris Harris	Pamela Fryman	November 9, 2009	5x07
Robin and Barney's relationship is tearing them apart so Ted and Marshall get Lily to help break them up.
The Playbook	Carter Bays Craig Thomas	Pamela Fryman	November 16, 2009	5x08
Barney dusts off his playbook filled with strategies on how to pick up women and Lily seeks to put a stop to it. Ted and Marshall insist Robin is about to fall in love.
Slapsgiving 2: Revenge of the Slap	Jamie Rhonheimer	Pamela Fryman	November 23, 2009	5x09
Thanksgiving 2009: Marshall bequeaths the fourth slap to Ted and Robin. Lily is reunited with her father.
The Window	Joe Kelly	Pamela Fryman	December 7, 2009	5x10
Ted finds out a girl he likes is finally single. The gang must keep her single long enough to seal the deal. Barney tries to pick up a girl wearing overalls and Marshall deals with a letter from himself.
Last Cigarette Ever	Theresa Mulligan Rosenthal	Pamela Fryman	December 14, 2009	5x11
Marshall restarts smoking to relate with his boss. The rest of the gang join him and then try to stop. Robin has to deal with an unprofessional co-anchor, Don.
Girls Versus Suits	Carter Bays Craig Thomas	Pamela Fryman	January 11, 2010	5x12
Barney must abandon suits to sleep with a hot bartender. Ted gets closer than ever to The Mother.
Jenkins	Greg Malins	Neil Patrick Harris	January 18, 2010	5x13
Lily doesn't react the way Marshall would expect when she is introduced to a female coworker. Ted's students use Robin's morning show as a drinking game.
Perfect Week	Craig Gerard Matthew Zinman	Pamela Fryman	February 1, 2010	5x14
Barney tries to land the perfect week: seven women in seven days. Meanwhile, the rest of the gang are all having a terrible week.
Rabbit or Duck	Carter Bays Craig Thomas	Pamela Fryman	February 8, 2010	5x15
Robin can't decide if she likes Don. Barney gets a "magical" cell phone that doesn't stop ringing. Ted asks Marshall and Lily to set him up for Valentine's Day.
Hooked	Kourtney Kang	Pamela Fryman	March 1, 2010	5x16
Ted is being strung along by a girl, Tiffany, and the gang recount their own similar stories. Meanwhile, Barney is overjoyed to discover Tiffany is a pharmaceutical sales rep, an occupation filled with hot girls.
Of Course	Matt Kuhn	Pamela Fryman	March 8, 2010	5x17
Barney tries to sleep with a women who wrote a book on how to avoid men like Barney. The gang learns that Robin is still taking her break up with Barney hard. Robin deals with her newly realized feelings for Don.
Say Cheese	Robia Rashid	Pamela Fryman	March 22, 2010	5x18
Marshall has planned an intimate party for Lily's 32nd birthday. But things get awkward when Ted shows up with a date. Meanwhile, Robin tries to get a bad picture of Barney.
Zoo or False	Stephen Lloyd	Pamela Fryman	April 12, 2010	5x19
Marshall comes up with a number of different outrageous and embarrassing stories to explain how he was mugged in Central Park, but which of his stories is the truth?
Home Wreckers	Chris Harris	Pamela Fryman	April 19, 2010	5x20
Ted reacts to his mother's second marriage by buying a house. Barney makes fun of Robin for crying at the wedding.
Twin Beds	Theresa Mulligan Rosenthal	Pamela Fryman	May 3, 2010	5x21
Don and Robin plan to move in together, prompting Ted and Barney to realize neither is over Robin yet. Marshall and Lily realize they enjoy sleeping in separate beds.
Robots Versus Wrestlers	Jamie Rhonheimer	Rob Greenberg	May 10, 2010	5x22
While Barney, Lily and Marshall watch a robots vs. wrestlers event, Ted attends a different kind of party. Robin continues avoiding the group to build a better relationship with Don.
The Wedding Bride	Stephen Lloyd	Pamela Fryman	May 17, 2010	5x23
Tony's movie, The Wedding Bride, is released. It turns out to be based entirely around the wedding between Ted and Stella and Tony's involvement. However, in the movie, Ted is a villian and Tony is a hero. The gang all see the movie and reflect upon it.
Doppelgangers	Carter Bays Craig Thomas	Pamela Fryman	May 24, 2010	5x24
Marshall and Lily spot Barney's doppelganger, fulfilling the requirements they set to start trying to have a baby. Robin is offered a better job in Chicago, and is in a dilemma about what to do.