Taking place immediately after where the previous season left off, Season 9 covers the events of a single weekend that lead up to Barney and Robin's wedding. During the course of the weekend, "The Mother" is separately introduced to Robin, Barney, Lily, and Marshall, before finally meeting Ted. The season also features frequent flashbacks and flashforwards in order to fully integrate The Mother's character with the rest of the cast.
Yay! The season is available for streaming online and you can watch Season 9 on Hotstar.