The Season 8 finale of "How I Met Your Mother" will air Monday at 8 p.m. on CBS and the network has released a promo video for the episode that teases the "mother of all secrets."
Watch the brief video below:
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The promo is incredibly brief and purposefully vague, as the "mother of all secrets" could refer to just about anything. The language used would lead one to believe that the titular Mother would finally appear, but the show has teased that in the past only to leave fans wanting more. And with a full ninth season upcoming, that could very well happen again.
"How I Met Your Mother" opened Season 8 by giving fans a glimpse of the moment Ted meets his future wife, which seemingly takes place shortly after Barney and Robin's wedding. The show has built to the nuptials all season, but take note of the episode description for the finale:
"As the gang prepares to head out to Robin and Barney's wedding, Ted invites Lily to see the house he's finally finished fixing up. Meanwhile, Robin and Barney's night of relaxation is ruined by an obnoxious couple, and Marshall takes the baby on a last-minute trip to Minnesota to see his family."
Notice that the description does not say anything about the wedding itself, just that the "gang prepares to head out" to it. And why would Marshall take his son to Minnesota if the wedding were imminent? That seems like a lot for the writers to cram into one episode, as the wedding would likely need an entire half hour devoted solely to that event.
The "obnoxious couple" in question will be portrayed by Keegan-Michael Key (Comedy Central's "Key & Peele") and Casey Wilson ("Happy Endings"). Some have theorized that Wilson could be the Mother.