HIMYM First Photo: New Guy Andrew Rannells Crashes Barney and Robin's Wedding

Andrew Rannells is causing drama on How I Met Your Mother.

The New Normal alum will guest-star on an upcoming Season 9 episode of the CBS comedy, the network announced on Monday.

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Per an official episode description, Rannells will play Darren, a guy at Barney and Robin’s wedding who intentionally stirs up trouble among the gang.

Also of note: Marshall will — spoiler alert! — finally arrive at the Farhampton Inn in the same ep, airing Dec. 16.

HIMYM fans, what are you more excited for: Rannells’ sure-to-be funny guest spot or Marshall getting to the wedding at last (and not a moment too soon)?