Riverdale Goes Retro For Milestone 100th Episode — See The Neat-O Photos

Riverdale is going back to its Archie Comics roots for its upcoming 100th episode — and gee, doesn't it look swell?

The milestone episode, airing Tuesday, Dec. 14 at 9/8c on The CW, whisks Archie and the gang back to the 1950s, enjoying some time at Pop's in retro outfits from the original Archie comic books. Archie, Betty and Veronica share a milkshake — and yes, that classic love triangle is in full effect here — while Jughead sports his signature crown hat and Fangs rocks a black leather jacket.

But what brings on this blast from the past? The episode, which also marks the final installment of the five-episode "Rivervale" event, is titled "The Jughead Paradox," and the official description is cryptic: "Unnerved by a series of strange happenings around him, Jughead's quest for answers leads him to uncover the truth about Rivervale." Is this an alternate dimension? Is it all a dream? Was the whole event just a novel Jughead is writing? After all the craziness this show has thrown at us, we can't rule anything out.

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The photos also tease some contemporary moments as well, including Archie with his arm around Betty, looking very couple-y — and the return of Ethel Muggs! (We haven't seen her since Season 4.) Check out the gallery to the right — or click here for direct access — for a first look at Riverdale's 100th episode, and grab a booth in the comments below to share your thoughts and predictions.