We've been promised a game-changing premiere of How I Met Your Mother September 20. Now, we've got your first look - a dozen or so - of the episode, entitled "Big Days."

While Marshall can't keep quiet about his desire to start a family with Lily, Ted and Barney argue about who has "dibs" on a hot girl, only to realize she's there with Cindy.

Rachel Bilson reprises her character, bringing us closer to the ever-elusive Mother. Elsewhere, Robin is still heartbroken over Don. See photos from the premiere below ...

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