Watch How I Met Your Mother Season 9, Episode 15 Unpause Online

When Barney drinks too much, Ted and Robin take advantage of him and get him to reveal secrets he's been hiding for years. Meanwhile, Marshall does everything he can to avoid fighting with Lily. In an attempt to deliver a devastating final slap to Barney, Marshall explains how he mastered the Slap of A Million Exploding Suns The gang encounters a guy at the wedding who intentionally stirs up trouble among them, and Marshall finally arrives at the Farhampton Inn. Barney becomes fixated on having his rehearsal dinner at a laser tag arena, much to Robin's dismay. Meanwhile, Ted doesn't come through on a promise, which aggravates Lily Marshall tries to get Marvin to sleep by reciting three rhyming bedtime tales about his friends as they wind down their epic cross-country journey. When Barney's father arrives at the hotel, Barney devises a plan that makes Robin very nervous. Meanwhile, Ted is convinced someone framed him by messing up a wedding-related duty In a flashback episode, the gang ponders the future of the Ted, Robin and Barney love triangle. Meanwhile, Barney accepts a series of challenges from Lily and Robin 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. When Daphne sends a troubling text message to Lily, Marshall enlists the gang's help to remove the message while enforcing the "No Questions Asked" rule When Ted finds himself with three prospects to be his date for the wedding weekend, he chooses poorly. Meanwhile, Barney and Robin have a confrontation with their minister, and Marshall learns more about his driving companion, Daphne. When Barney is forced to pick sides in a fight between Robin and his mother, Lily coaches him on how not to ruin his relationship. Meanwhile, Ted and Marshall get into a dispute over wedding gifts and thank-you notes While Barney works through his anger at Ted after finding out he still has feelings for Robin, Marshall Skypes in to act as a judge and help settle their dispute. Meanwhile, Lily realizes she is Robin's only girlfriend. When Lily discovers Ted's list of things he wants to do in New York before he moves for Chicago, she becomes frustrated that she is the only person who knows about his plans. Meanwhile, Robin and Barney realize they have very little time together before their relatives arrive for their wedding. Robin worries about how Barney will take the news that his brother is getting a divorce. Meanwhile Marshall tries everything he can to get to the wedding in time. Travelling to Long Island Robin and Barney come across a startling family discovery and Lily doubts Ted really has let go of Robin. As the gang gets ready for Robin and Barney's wedding, Ted invites Lily to see the house he has finished fixing up; an obnoxious couple ruins Barney and Robin's night of relaxation; Marshall takes the baby to Minnesota for a family visit. The gang tries to plan a legendary bachelor party for Barney. Lily worries Marshall will resent her if she accepts The Captain's offer to move to Rome for a year; Ted and Barney obsess over an attractive girl in a puffy coat. Future versions of Ted and Barney try to talk Ted into seeing Robots Versus Wrestlers; Marshall wants to have a dance-off with Robin. Robin would like Barney to sell his bachelor pad so they can get a place of their own, but he is somewhat reluctant and goes to great lengths to sabotage any potential sale. Meanwhile, Lily's art-consultant position with the Captain impacts her relationship her husband. After Ted and Jeanette break up, Barney uses his infamous playbook to Ted find a new date; Lily tries to make a good impression at a gallery opening. When the Captain calls Ted unexpectedly, the gang remembers their last awkward encounter. Ted is gun-shy about breaking up with his wacky new girlfriend. Meanwhile, Robin finally breaks down and holds baby Marvin, and finds herself becoming incredibly attached to the little guy. Barney discovers a lost episode of a behind-the-music show that features Canadian teen singing sensation Robin Sparkles (aka Robin), and includes a new video and another intriguing revelation from her past. Meanwhile, Marshall and Lily suspect that Ted's new girlfriend is a stalker. Barney asks Ted to keep dating Carly (Ashley Benson), a much younger woman, even though she and Ted have nothing in common. Despite having already popped the question, Robin insists that Barney seek her father's permission before the couple can announce their engagement. Meanwhile, a conflicted Ted throws himself into the planning of the their wedding. With Christmas fast approaching, Barney tells Ted that he plans on proposing to Patrice, which leads Ted to debate whether or not to tell Robin. Meanwhile, Marshall and Lily run into an acquaintance from college, on a special one-hour episode of HOW I MET YOUR MOTHER. Robin becomes increasingly suspicious of Barney’s relationship with Patrice. Meanwhile, Marshall discovers his mother is moving on in her romantic life… with a very disturbing partner. A determined Robin contemplates one last fling with Barney and devises a scheme to entice him into an assignation. Meanwhile, Ted steps in as Marvin's nanny, and Marshall and Lily realize there's a definite motive behind the move. Unable to decide which of their friends would make the best godparents to Marvin, Lily and Marshall put them all to a test. Lily and Marshall have trouble finding a nanny for Marvin and learn that it is due to an elaborate scheme Barney invented to meet women. Meanwhile, Robin and Ted argue over who is in a more serious relationship. Barney's extensive and comprehensive prenup leads the guys to put forth their own relationship principles, which their significant others do not find agreeable. Meanwhile, an incensed Quinn responds with her own prenup. The sitcom rings in Season 8 with wedding bells for the impending nuptials of Barney and Robin, but concerns that one or both of them will get cold feet cloud the happy time. Meanwhile, all the matrimonial jitters trigger Ted's memories of Victoria's wedding day and how he insisted that she leave her fiancé a note after deciding to leave him at the altar.