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The Mermaid Theory

When Ted's new friendship with Zoey tests the theory that single men and married women can't be friends, he invites her husband, "The Captain," to hang out with them. Meanwhile, Marshall and Robin decide to spend alone time together, and Barney and Lily possibly have a fight.

Episodes
Robin Daggers - P.S I Love You Music Video
: Robin Daggers - P.S I Love You Music Video
0m
: Robin Daggers - P.S I Love You Music Video
Marshall’s Music Video - Best Night Ever
: Marshall’s Music Video - Best Night Ever
0m
: Marshall’s Music Video - Best Night Ever
The Beaver Song
: The Beaver Song
0m
: The Beaver Song
A Night With Your Mother Panel Discussion
: A Night With Your Mother Panel Discussion
0m
: A Night With Your Mother Panel Discussion
Nothing Suits Me Like A Suit
: Nothing Suits Me Like A Suit
0m
: Nothing Suits Me Like A Suit
Barney Stinson's Video Resume
: Barney Stinson's Video Resume
0m
: Barney Stinson's Video Resume
Lily and Marshall's Honeymoon Videos
: Lily and Marshall's Honeymoon Videos
0m
: Lily and Marshall's Honeymoon Videos
Marshall's Music Video - You Just Got Slapped
: Marshall's Music Video - You Just Got Slapped
0m
: Marshall's Music Video - You Just Got Slapped
Robin Sparkles Music Video - Sandcastles In the Sand
: Robin Sparkles Music Video - Sandcastles In the Sand
0m
: Robin Sparkles Music Video - Sandcastles In the Sand
Robin Sparkles Music Video - Let's Go to the Mall
: Robin Sparkles Music Video - Let's Go to the Mall
0m
: Robin Sparkles Music Video - Let's Go to the Mall
Come On
: Come On
0m
: Come On
Milk
: Milk
0m
: Milk
Best Prom Ever
: Best Prom Ever
0m
: Best Prom Ever
Mary the Paralegal
: Mary the Paralegal
0m
: Mary the Paralegal
Nothing Good Happens After 2 A.M.
: Nothing Good Happens After 2 A.M.
0m
: Nothing Good Happens After 2 A.M.
Life Among the Gorillas
: Life Among the Gorillas
0m
: Life Among the Gorillas
Cupcake
: Cupcake
0m
: Cupcake
Game Night
: Game Night
0m
: Game Night
Zip, Zip, Zip
: Zip, Zip, Zip
0m
: Zip, Zip, Zip
Drumroll, Please
: Drumroll, Please
0m
: Drumroll, Please
The Wedding
: The Wedding
0m
: The Wedding
The Limo
: The Limo
0m
: The Limo
The Pineapple Incident
: The Pineapple Incident
0m
: The Pineapple Incident
Belly Full of Turkey
: Belly Full of Turkey
0m
: Belly Full of Turkey
The Duel
: The Duel
0m
: The Duel
Matchmaker
: Matchmaker
0m
: Matchmaker
The Slutty Pumpkin
: The Slutty Pumpkin
0m
: The Slutty Pumpkin
Okay Awesome
: Okay Awesome
0m
: Okay Awesome
Return of the Shirt
: Return of the Shirt
0m
: Return of the Shirt
Sweet Taste of Liberty
: Sweet Taste of Liberty
0m
: Sweet Taste of Liberty
Purple Giraffe
: Purple Giraffe
0m
: Purple Giraffe
Pilot
: Pilot
0m
: Pilot
Something Blue
: Something Blue
0m
: Something Blue
Something Borrowed
: Something Borrowed
0m
: Something Borrowed
Showdown
: Showdown
0m
: Showdown
Bachelor Party
: Bachelor Party
0m
: Bachelor Party
Moving Day
: Moving Day
0m
: Moving Day
Arrivederci, Fiero
: Arrivederci, Fiero
0m
: Arrivederci, Fiero
Stuff
: Stuff
0m
: Stuff
Lucky Penny
: Lucky Penny
0m
: Lucky Penny
Monday Night Football
: Monday Night Football
0m
: Monday Night Football
Columns
: Columns
0m
: Columns
First Time in New York
: First Time in New York
0m
: First Time in New York
How Lily Stole Christmas
: How Lily Stole Christmas
0m
: How Lily Stole Christmas
Single Stamina
: Single Stamina
0m
: Single Stamina
Slap Bet
: Slap Bet
0m
: Slap Bet
Atlantic City
: Atlantic City
0m
: Atlantic City
Swarley
: Swarley
0m
: Swarley
Aldrin Justice
: Aldrin Justice
0m
: Aldrin Justice
World's Greatest Couple
: World's Greatest Couple
0m
: World's Greatest Couple
Ted Mosby, Architect
: Ted Mosby, Architect
0m
: Ted Mosby, Architect
Brunch
: Brunch
0m
: Brunch
The Scorpion and the Toad
: The Scorpion and the Toad
0m
: The Scorpion and the Toad
Where Were We?
: Where Were We?
0m
: Where Were We?
Miracles
: Miracles
0m
: Miracles
Everything Must Go
: Everything Must Go
0m
: Everything Must Go
Rebound Bro
: Rebound Bro
0m
: Rebound Bro
The Goat
: The Goat
0m
: The Goat
Sandcastles in the Sand
: Sandcastles in the Sand
0m
: Sandcastles in the Sand
The Chain of Screaming
: The Chain of Screaming
0m
: The Chain of Screaming
The Bracket
: The Bracket
0m
: The Bracket
Ten Sessions
: Ten Sessions
0m
: Ten Sessions
No Tomorrow
: No Tomorrow
0m
: No Tomorrow
The Platinum Rule
: The Platinum Rule
0m
: The Platinum Rule
The Yips
: The Yips
0m
: The Yips
Slapsgiving
: Slapsgiving
0m
: Slapsgiving
Spoiler Alert
: Spoiler Alert
0m
: Spoiler Alert
Dowisetrepla
: Dowisetrepla
0m
: Dowisetrepla
I'm Not That Guy
: I'm Not That Guy
0m
: I'm Not That Guy
How I Met Everyone Else
: How I Met Everyone Else
0m
: How I Met Everyone Else
Little Boys
: Little Boys
0m
: Little Boys
Third Wheel
: Third Wheel
0m
: Third Wheel
We're Not from Here
: We're Not from Here
0m
: We're Not from Here
Wait For It
: Wait For It
0m
: Wait For It
The Leap
: The Leap
0m
: The Leap
As Fast as She Can
: As Fast as She Can
0m
: As Fast as She Can
Right Place, Right Time
: Right Place, Right Time
0m
: Right Place, Right Time
The Three Days Rule
: The Three Days Rule
0m
: The Three Days Rule
Mosbius Designs
: Mosbius Designs
0m
: Mosbius Designs
Murtaugh
: Murtaugh
0m
: Murtaugh
Old King Clancy
: Old King Clancy
0m
: Old King Clancy
The Front Porch
: The Front Porch
0m
: The Front Porch
Sorry, Bro
: Sorry, Bro
0m
: Sorry, Bro
The Stinsons
: The Stinsons
0m
: The Stinsons
The Possimpible
: The Possimpible
0m
: The Possimpible
Three Days of Snow
: Three Days of Snow
0m
: Three Days of Snow
Benefits
: Benefits
0m
: Benefits
Little Minnesota
: Little Minnesota
0m
: Little Minnesota
The Fight
: The Fight
0m
: The Fight
The Naked Man
: The Naked Man
0m
: The Naked Man
Woooo!
: Woooo!
0m
: Woooo!
Not a Father's Day
: Not a Father's Day
0m
: Not a Father's Day
Happily Ever After
: Happily Ever After
0m
: Happily Ever After
Shelter Island
: Shelter Island
0m
: Shelter Island
Intervention
: Intervention
0m
: Intervention
I Heart NJ
: I Heart NJ
0m
: I Heart NJ
The Best Burger in New York
: The Best Burger in New York
0m
: The Best Burger in New York
Do I Know You?
: Do I Know You?
0m
: Do I Know You?
Doppelgangers
: Doppelgangers
0m
: Doppelgangers
The Wedding Bride
: The Wedding Bride
0m
: The Wedding Bride
Robots vs. Wrestlers
: Robots vs. Wrestlers
0m
: Robots vs. Wrestlers
Twin Beds
: Twin Beds
0m
: Twin Beds
Home Wreckers
: Home Wreckers
0m
: Home Wreckers
Zoo or False
: Zoo or False
0m
: Zoo or False
Say Cheese
: Say Cheese
0m
: Say Cheese
Of Course
: Of Course
0m
: Of Course
Hooked
: Hooked
0m
: Hooked
Rabbit or Duck
: Rabbit or Duck
0m
: Rabbit or Duck
Perfect Week
: Perfect Week
0m
: Perfect Week
Jenkins
: Jenkins
0m
: Jenkins
Girls vs. Suits
: Girls vs. Suits
0m
: Girls vs. Suits
Last Cigarette Ever
: Last Cigarette Ever
0m
: Last Cigarette Ever
The Window
: The Window
0m
: The Window
Slapsgiving 2: Revenge of the Slap
: Slapsgiving 2: Revenge of the Slap
0m
: Slapsgiving 2: Revenge of the Slap
The Playbook
: The Playbook
0m
: The Playbook
The Rough Patch
: The Rough Patch
0m
: The Rough Patch
Bagpipes
: Bagpipes
0m
: Bagpipes
Duel Citizenship
: Duel Citizenship
0m
: Duel Citizenship
The Sexless Innkeeper
: The Sexless Innkeeper
0m
: The Sexless Innkeeper
Robin 101
: Robin 101
0m
: Robin 101
Double Date
: Double Date
0m
: Double Date
Definitions
: Definitions
0m
: Definitions
Challenge Accepted
: Challenge Accepted
0m
: Challenge Accepted
Landmarks
: Landmarks
0m
: Landmarks
The Perfect Cocktail
: The Perfect Cocktail
0m
: The Perfect Cocktail
Hopeless
: Hopeless
0m
: Hopeless
The Exploding Meatball Sub
: The Exploding Meatball Sub
0m
: The Exploding Meatball Sub
Legendaddy
: Legendaddy
0m
: Legendaddy
A Change of Heart
: A Change of Heart
0m
: A Change of Heart
Garbage Island
: Garbage Island
0m
: Garbage Island
Desperation Day
: Desperation Day
0m
: Desperation Day
Oh Honey
: Oh Honey
0m
: Oh Honey
Last Words
: Last Words
0m
: Last Words
Bad News
: Bad News
0m
: Bad News
False Positive
: False Positive
0m
: False Positive
The Mermaid Theory
: The Mermaid Theory
0m
: The Mermaid Theory
Blitzgiving
: Blitzgiving
0m
: Blitzgiving
Glitter
: Glitter
0m
: Glitter
Natural History
: Natural History
0m
: Natural History
Canning Randy
: Canning Randy
0m
: Canning Randy
Baby Talk
: Baby Talk
0m
: Baby Talk
Architect of Destruction
: Architect of Destruction
0m
: Architect of Destruction
Subway Wars
: Subway Wars
0m
: Subway Wars
Unfinished
: Unfinished
0m
: Unfinished
Cleaning House
: Cleaning House
0m
: Cleaning House
Big Days
: Big Days
0m
: Big Days
The Magician's Code (2)
: The Magician's Code (2)
0m
: The Magician's Code (2)
The Magician's Code (1)
: The Magician's Code (1)
0m
: The Magician's Code (1)
Good Crazy
: Good Crazy
0m
: Good Crazy
Now We're Even
: Now We're Even
0m
: Now We're Even
Trilogy Time
: Trilogy Time
0m
: Trilogy Time
The Broath
: The Broath
0m
: The Broath
Karma
: Karma
0m
: Karma
No Pressure
: No Pressure
0m
: No Pressure
The Drunk Train
: The Drunk Train
0m
: The Drunk Train
The Burning Beekeeper
: The Burning Beekeeper
0m
: The Burning Beekeeper
46 Minutes
: 46 Minutes
0m
: 46 Minutes
Tailgate
: Tailgate
0m
: Tailgate
Symphony of Illumination
: Symphony of Illumination
0m
: Symphony of Illumination
The Rebound Girl
: The Rebound Girl
0m
: The Rebound Girl
Tick Tick Tick
: Tick Tick Tick
0m
: Tick Tick Tick
Disaster Averted
: Disaster Averted
0m
: Disaster Averted
The Slutty Pumpkin Returns
: The Slutty Pumpkin Returns
0m
: The Slutty Pumpkin Returns
Noretta
: Noretta
0m
: Noretta
Mystery vs. History
: Mystery vs. History
0m
: Mystery vs. History
Field Trip
: Field Trip
0m
: Field Trip
The Stinson Missile Crisis
: The Stinson Missile Crisis
0m
: The Stinson Missile Crisis
Ducky Tie
: Ducky Tie
0m
: Ducky Tie
The Naked Truth
: The Naked Truth
0m
: The Naked Truth
The Best Man
: The Best Man
0m
: The Best Man
Something New
: Something New
0m
: Something New
Something Old
: Something Old
0m
: Something Old
The Bro Mitzvah
: The Bro Mitzvah
0m
: The Bro Mitzvah
Romeward Bound
: Romeward Bound
0m
: Romeward Bound
The Time Travelers
: The Time Travelers
0m
: The Time Travelers
The Fortress
: The Fortress
0m
: The Fortress
Weekend at Barney's
: Weekend at Barney's
0m
: Weekend at Barney's
The Ashtray
: The Ashtray
0m
: The Ashtray
Bad Crazy
: Bad Crazy
0m
: Bad Crazy
P.S. I Love You
: P.S. I Love You
0m
: P.S. I Love You
Ring Up!
: Ring Up!
0m
: Ring Up!
Band or DJ?
: Band or DJ?
0m
: Band or DJ?
The Final Page (2)
: The Final Page (2)
0m
: The Final Page (2)
The Final Page (1)
: The Final Page (1)
0m
: The Final Page (1)
The Over-Correction
: The Over-Correction
0m
: The Over-Correction
Lobster Crawl
: Lobster Crawl
0m
: Lobster Crawl
Twelve Horny Women
: Twelve Horny Women
0m
: Twelve Horny Women
The Stamp Tramp
: The Stamp Tramp
0m
: The Stamp Tramp
Splitsville
: Splitsville
0m
: Splitsville
The Autumn of Break-Ups
: The Autumn of Break-Ups
0m
: The Autumn of Break-Ups
Who Wants to Be a Godparent?
: Who Wants to Be a Godparent?
0m
: Who Wants to Be a Godparent?
Nannies
: Nannies
0m
: Nannies
The Pre-Nup
: The Pre-Nup
0m
: The Pre-Nup
Farhampton
: Farhampton
0m
: Farhampton
Last Forever (2)
: Last Forever (2)
0m
: Last Forever (2)
Last Forever (1)
: Last Forever (1)
0m
: Last Forever (1)
The End of the Aisle
: The End of the Aisle
0m
: The End of the Aisle
Gary Blauman
: Gary Blauman
0m
: Gary Blauman
Daisy
: Daisy
0m
: Daisy
Vesuvius
: Vesuvius
0m
: Vesuvius
Rally
: Rally
0m
: Rally
Sunrise
: Sunrise
0m
: Sunrise
How Your Mother Met Me
: How Your Mother Met Me
0m
: How Your Mother Met Me
Unpause
: Unpause
0m
: Unpause
Slapsgiving 3: Slappointment in Slapmarra
: Slapsgiving 3: Slappointment in Slapmarra
0m
: Slapsgiving 3: Slappointment in Slapmarra
Bass Player Wanted
: Bass Player Wanted
0m
: Bass Player Wanted
The Rehearsal Dinner
: The Rehearsal Dinner
0m
: The Rehearsal Dinner
Bedtime Stories
: Bedtime Stories
0m
: Bedtime Stories
Mom and Dad
: Mom and Dad
0m
: Mom and Dad
Platonish
: Platonish
0m
: Platonish
The Lighthouse
: The Lighthouse
0m
: The Lighthouse
No Questions Asked
: No Questions Asked
0m
: No Questions Asked
Knight Vision
: Knight Vision
0m
: Knight Vision
The Poker Game
: The Poker Game
0m
: The Poker Game
The Broken Code
: The Broken Code
0m
: The Broken Code
Last Time in New York
: Last Time in New York
0m
: Last Time in New York
Coming Back
: Coming Back
0m
: Coming Back
The Locket
: The Locket
0m
: The Locket
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