Mad Men Season 7 Spoilers
What will happen in the Season 7 Part 1 finale of "Mad Men"? AMC

Can you believe that the Season 7 Part 1 finale of “Mad Men” is already here? It seems like just yesterday Don was trying to woo Megan on the West Coast. But now, when episode 7, “Waterloo,” airs on Sunday, May 25 at 9 p.m. EDT, fans will get to watch the tables completely turn -- or at least, that’s what we were led to believe from the suspenseful finale promo.

Before we dive into the finale trailer, let’s talk about the interesting title given to episode 7: What is “Waterloo”? According to its definition, a waterloo is a decisive or final defeat or setback, commonly related to Napoleon’s defeat in the Battle of Waterloo on June 18, 1815. With that said, we can tell Matthew Weiner is setting fans up for a nail-bitter of an episode. So, if you thought the Part 1 finale would be cliff-hanger free… think again!

“Don is troubled by a letter; Peggy may seek a new future on a risky venture; Roger receives a phone call; Pete and Cutler butt heads,” the scant summary for the show’s last episode of Part 1 teases.

To help us make sense of what will happen in episode 7, “Mad Men” released its most revealing promo yet:

Yes, of course we were kidding! When does the hit AMC series ever give us substantial hints to quench our “Mad Men” thirst? For those who didn’t catch it, the promo was chock-full of flashback scenes. From Don getting his job back at SC&P to his racy ménage à trois with Megan and her friend, viewers were surprised with a blast from “Mad Men” past all while listening to climatic music sure to raise your heart rate.

The only new scene from the trailer was a clip of Don opening up his plane window, letting sun into his gloomy surroundings.

“It’s all up in the air,” the trailer teased, ending the promo.

What do you think will occur in the Season 7 Part 1 finale of “Mad Men”? Chime in with your thoughts in the comments section below and don’t forget to tune into the drama Sunday night to find out what will be going down in the world of advertising.